EP1612757A2 - Method and apparatus for vehicle on-board signalling, mobile traffic sign and vehicle - Google Patents

Abstract

The method involves associating a receiver (122) of a motor vehicle (A1) to a transmitter (121). Signals (S4, S2) are transmitted by the transmitter to destination of another receiver (222) of another motor vehicle (A2) next to the vehicle (A1). Road signaling information (IL) coded in a signal (S1) received by the receiver (122) is transmitted to the receiver (222). The information (IL) is used on one of the vehicles. Independent claims are also included for the following: (A) a device for implementing a motor vehicle signaling method (B) a motor vehicle.

Description

The invention relates to a method and a signaling device on board a motor vehicle, a road sign, a module intended to be mounted on a motor vehicle and the motor vehicle equipped with it.

Document FR-A-2 699 946 discloses a set of road signs, in which signals coding a traffic signal information are emitted by a radio transmitter of short range from a road sign to the roadway, to be received by a receiver of a motor vehicle driving on the roadway and displaying the traffic signal information on a screen of the vehicle.

This set has the disadvantage of having a very limited field of application, because of not only the small range of the radio transmitter but also the power consumption of the radio transmitter, which considerably reduces its autonomy.

In particular, this set is not intended for applications where the panel is portable and must have its own power supply means.

Such applications are present for example in road signs posted on or at the edge of the roadway in case of work or accidents.

In these and other applications, it is often desirable for road users to be alerted to road sign information early enough before passing the sign, particularly to avoid accidents and even over-accidents (consecutive accidents). an accident already present on the road, such as piling up with damaged vehicles, or percussion of emergency vehicles and emergency personnel).

The invention aims at obtaining a method and a signaling device on board a motor vehicle, a road sign, a module intended to be mounted on a motor vehicle and the motor vehicle provided with it, to overcome the disadvantages of the state of the art.

An object of the invention is to increase the range of the transmission of signals encoding the traffic signal information, emitted by the panel.

Another object of the invention is to increase the autonomy of the panel.

For this purpose, a first object of the invention is a method of signaling on board a motor vehicle, in which signals encoding road signaling information are transmitted wirelessly to the roadway by transmission means provided on a vehicle. road sign and are received by a first receiver of a first motor vehicle rolling on the roadway,
characterized in that
the first receiver of the first motor vehicle is associated therewith with a first transmitter, which wirelessly transmits signals to a second motor vehicle rolling on the road and following the first motor vehicle, for transmission to a second receiver of the second motor vehicle, the traffic signal information contained in the signals received by the first receiver, the transmitted traffic signal information being intended to be operated on at least one of said vehicles.

• lorsque le premier récepteur a reçu lesdits signaux codant l'information de signalisation routière, le premier émetteur associé transmet automatiquement sans fil lesdits signaux d'interrogation de présence du deuxième récepteur du deuxième véhicule automobile roulant sur la chaussée et suivant le premier véhicule automobile, et
  en cas de réception desdits signaux d'interrogation par le deuxième récepteur du deuxième véhicule automobile roulant sur la chaussée et suivant le premier véhicule automobile, un deuxième émetteur associé sur le deuxième véhicule automobile au deuxième récepteur transmet sans fil au premier récepteur un accusé de réception desdits signaux d'interrogation, ce qui déclenche la transmission sans fil par le premier émetteur de signaux codant l'information de signalisation routière contenue dans les signaux reçus par le premier récepteur au deuxième récepteur du deuxième véhicule automobile ;
• lorsque le premier récepteur a reçu lesdits signaux codant l'information de signalisation routière, le premier émetteur associé transmet automatiquement sans fil lesdits signaux codant l'information de signalisation routière contenue dans les signaux reçus par le premier récepteur au deuxième récepteur du deuxième véhicule automobile ;
• le deuxième récepteur du deuxième véhicule automobile est associé sur celui-ci à un deuxième émetteur, lequel, lorsque le deuxième récepteur a reçu l'information de signalisation routière contenue dans les signaux reçus par le premier récepteur, transmet sans fil des signaux à destination d'un troisième véhicule automobile roulant sur la chaussée et suivant le deuxième véhicule automobile, en vue de la transmission à un troisième récepteur du troisième véhicule automobile, de l'information de signalisation routière transmise au deuxième récepteur, l'information de signalisation routière transmise étant destinée à être exploitée sur au moins l'un desdits véhicules ;
• lorsque le deuxième récepteur a reçu l'information de signalisation routière contenue dans les signaux reçus par le premier récepteur, le deuxième émetteur associé transmet automatiquement sans fil lesdits signaux d'interrogation de présence du troisième récepteur du troisième véhicule automobile roulant sur la chaussée et suivant le deuxième véhicule automobile, et
  en cas de réception desdits signaux d'interrogation par le troisième récepteur du troisième véhicule automobile roulant sur la chaussée et suivant le deuxième véhicule automobile, un troisième émetteur associé sur le troisième véhicule automobile au troisième récepteur transmet sans fil au deuxième récepteur un accusé de réception desdits signaux d'interrogation, ce qui déclenche la transmission sans fil par le deuxième émetteur de signaux codant l'information de signalisation routière contenue dans les signaux reçus par le deuxième récepteur au troisième récepteur du troisième véhicule automobile ;
• lorsque le deuxième récepteur a reçu l'information de signalisation routière contenue dans les signaux reçus par le premier récepteur, le deuxième émetteur associé transmet automatiquement sans fil lesdits signaux codant l'information de signalisation routière contenue dans les signaux reçus par le deuxième récepteur au troisième récepteur du troisième véhicule automobile ;
• au moins l'un déterminé desdits véhicules automobiles comporte un limiteur automatique de vitesse de déplacement réglé par une valeur de vitesse maximum,
  l'information de signalisation routière contient une information de limitation de vitesse à une valeur prescrite,
  une étape de commande du limiteur de vitesse est exécutée sur ledit véhicule automobile déterminé, au cours de laquelle la réception, par le récepteur dudit véhicule automobile déterminé, de l'information de limitation de vitesse contenue dans les signaux reçus par le premier récepteur déclenche automatiquement la commande de son limiteur de vitesse à la valeur maximum de vitesse prescrite par cette information de limitation de vitesse ;
• sur au moins l'un déterminé desdits véhicules automobiles, le papillon des gaz est commandé par une information d'accélération, qui est déterminée par un calculateur à partir de la position de l'accélérateur du véhicule,
  l'information de signalisation routière contient une information de limitation de vitesse à une valeur prescrite,
  on surveille une valeur de vitesse réelle de déplacement mesurée sur le véhicule, pour que, temporairement la commande du papillon des gaz de ce véhicule par l'information d'accélération soit inhibée si il a été déterminé que la valeur de vitesse réelle de déplacement du véhicule est supérieure à celle indiquée par l'information de limitation de vitesse ;
• l'émetteur d'un véhicule cesse d'émettre les signaux en vue de la transmission de l'information de signalisation routière, après qu'a été détecté que son premier récepteur associé a reçu, en provenance de l'émetteur d'un autre véhicule, des signaux codant l'information de signalisation routière et ayant un même code que celui des signaux que ce premier émetteur a émis ;
• lorsque le récepteur d'au moins l'un desdits véhicules automobiles a reçu l'information de signalisation routière contenue dans les signaux reçus par le premier récepteur, cette information de signalisation routière est restituée par des moyens de présentation d'information au chauffeur de ce véhicule ;
• le récepteur ayant reçu dudit émetteur l'information de signalisation routière contenue dans les signaux reçus par le premier récepteur ignore les autres signaux codant l'information de signalisation routière qu'il reçoit, dans le cas où il détecte que ces autres signaux codant l'information de signalisation routière contiennent un code indiquant leur émission par le panneau ;
• en cas de réception par le récepteur d'un desdits véhicules de l'information de signalisation routière, le freinage de ce véhicule est surveillé par un moyen de contrôle prévu sur ce véhicule pour déclencher, en cas de détection d'un tel freinage, l'actionnement des feux de détresse du véhicule ;
• l'information de signalisation routière contient une information de limitation de vitesse à une vitesse prescrite et, en cas de réception par le récepteur d'un desdits véhicules de l'information de signalisation routière et en cas de détection d'une vitesse réelle de déplacement de celui-ci supérieure à celle indiquée par l'information de limitation de vitesse, un moyen de contrôle prévu sur ce véhicule déclenche l'actionnement des feux de détresse du véhicule ;
• en réponse à la réception par le premier récepteur des signaux codant l'information de signalisation routière, le premier émetteur retransmet en outre sans fil des signaux d'inhibition à destination du panneau,
  la réception, par un moyen de réception du panneau, des signaux d'inhibition émis, déclenchant l'arrêt au moins temporaire de l'émission des signaux codant l'information de signalisation routière par les moyens d'émission du panneau ;
• chaque véhicule automobile muni d'un récepteur de signaux codant l'information de signalisation routière est muni de moyens pour exploiter sur le véhicule l'information de signalisation routière contenue dans les signaux reçus par ce récepteur, ainsi que d'un émetteur associé, lequel retransmet sans fil des signaux codant l'information de signalisation routière contenue dans les signaux reçus par ce récepteur à destination d'un récepteur d'un autre véhicule automobile roulant sur la chaussée et les troisièmes signaux d'inhibition à destination du panneau.

According to other features of the invention,

• when the first receiver has received said signals coding the traffic signaling information, the first associated transmitter automatically transmits wirelessly said presence interrogation signals of the second receiver of the second motor vehicle rolling on the roadway and following the first motor vehicle, and
  if said interrogation signals are received by the second receiver of the second automobile vehicle traveling on the roadway and following the first motor vehicle, a second associated transmitter on the second motor vehicle to the second receiver wirelessly transmits to the first receiver an acknowledgment of said interrogation signals, which triggers the wireless transmission by the first signal transmitter coding the traffic signal information contained in the signals received by the first receiver; first receiver to the second receiver of the second motor vehicle;
• when the first receiver has received said signals encoding the traffic signaling information, the first associated transmitter automatically wirelessly transmits said signals encoding the traffic signal information contained in the signals received by the first receiver to the second receiver of the second motor vehicle;
• the second receiver of the second motor vehicle is associated therewith with a second transmitter, which, when the second receiver has received the traffic signal information contained in the signals received by the first receiver, transmits signals wirelessly to a third motor vehicle traveling on the road and following the second motor vehicle, for transmission to a third receiver of the third motor vehicle, the traffic signaling information transmitted to the second receiver, the traffic signal information transmitted being intended to be operated on at least one of said vehicles;
• when the second receiver has received the traffic signal information contained in the signals received by the first receiver, the second associated transmitter automatically wirelessly transmits said presence interrogation signals of the third receiver of the third motor vehicle rolling on the road and following the second motor vehicle, and
  in the event of reception of said interrogation signals by the third receiver of the third automobile vehicle traveling on the roadway and following the second motor vehicle, a third associated transmitter on the third motor vehicle to the third receiver transmits wirelessly to the second receiver an acknowledgment of receipt said interrogation signals, which initiates the wireless transmission by the second signal transmitter coding the traffic signal information contained in the signals received by the second receiver to the third receiver of the third motor vehicle;
• when the second receiver has received the traffic signal information contained in the signals received by the first receiver, the associated second transmitter automatically wirelessly transmits said signals encoding the traffic signal information contained in the signals received by the second receiver to the third receiver; receiver of the third motor vehicle;
• at least one of said motor vehicles has an automatic speed limiter set by a maximum speed value,
  the traffic signal information contains speed limitation information at a prescribed value,
  a step of controlling the speed limiter is performed on said determined motor vehicle, during which the reception, by the receiver of said determined motor vehicle, speed limitation information contained in the signals received by the first receiver triggers automatically controlling its speed limiter to the maximum speed value prescribed by this speed limitation information;
• on at least one determined of said motor vehicles, the throttle valve is controlled by an acceleration information, which is determined by a computer from the position of the accelerator of the vehicle,
  the traffic signal information contains speed limitation information at a prescribed value,
  an actual measured speed value of the displacement is monitored on the vehicle so that, temporarily, the control of the throttle valve of this vehicle by the acceleration information is inhibited if it has been determined that the actual vehicle speed value is greater than that indicated by the speed limitation information;
• the transmitter of a vehicle ceases to transmit signals for the transmission of traffic signaling information after it has been detected that its first associated receiver has received from the transmitter of another vehicle, signals encoding the traffic signal information and having the same code as the signals that the first emitter has emitted;
• when the receiver of at least one of said motor vehicles has received the traffic signal information contained in the signals received by the first receiver, this road signaling information is restored by means of information presentation to the driver of this vehicle;
• the receiver having received from said transmitter the road signaling information contained in the signals received by the first receiver ignores the other signals encoding the road signaling information it receives, in the event that it detects that these other signals coding the Road sign information contains a code indicating their emission by the sign;
• if the receiver of one of the said vehicles receives road signaling information, the braking of that vehicle is monitored by a control device provided on the vehicle to trigger, in the event of detection of such braking, the actuation of the vehicle hazard warning lights;
• the traffic signal information contains speed limitation information at a prescribed speed and, in the case of reception by the receiver of one of said vehicles of road signaling information and in the event of detection of a real speed of movement of the latter greater than that indicated by the speed limitation information, a control means provided on this vehicle triggers the activation of the hazard warning lights of the vehicle;
• in response to reception by the first receiver of the signals encoding the traffic signaling information, the first transmitter further retransmits wireless muting signals to the panel,
  reception, by means of reception of the panel, of the muting signals emitted, triggering the at least temporary stopping of the transmission of the signals encoding the traffic signaling information by the transmission means of the panel;
• each motor vehicle equipped with a signal receiver encoding the traffic signaling information is provided with means for operating on the vehicle the traffic signaling information contained in the signals received by this receiver, as well as an associated transmitter, which wirelessly retransmits signals coding the traffic signal information contained in the signals received by this receiver to a receiver of another motor vehicle rolling on the roadway and the third inhibition signals to the panel.

• un panneau de signalisation routière vers la chaussée, comportant des moyens d'émission sans fil vers la chaussée de signaux codant une information de signalisation,
• un premier récepteur des premiers signaux émis, qui est destiné à être monté à bord d'un premier véhicule automobile roulant sur la chaussée,

    caractérisé en ce que
le premier récepteur du premier véhicule automobile est associé sur celui-ci à un premier émetteur sans fil, apte à émettre des signaux codant l'information de signalisation routière contenue dans les signaux reçus par le premier récepteur, à destination d'un deuxième récepteur d'un deuxième véhicule automobile roulant sur la chaussée et suivant le premier véhicule automobile, un moyen d'exploitation de l'information de signalisation routière étant prévu pour être monté à bord d'au moins l'un desdits véhicules.A second object of the invention is a device for implementing the on-board signaling method of a motor vehicle described above, comprising:

• a traffic sign towards the carriageway, comprising means for wireless transmission towards the roadway of signals encoding signaling information,
• a first receiver of the first transmitted signals, which is intended to be mounted on board a first motor vehicle rolling on the roadway,

characterized in that
the first receiver of the first motor vehicle is associated therewith with a first wireless transmitter, capable of transmitting signals encoding the traffic signal information contained in the signals received by the first receiver, to a second receiver; a second motor vehicle rolling on the roadway and following the first motor vehicle, a means of exploiting the signaling information road being provided to be mounted on board at least one of said vehicles.

• une surface d'indication visuelle d'une information de signalisation routière, la surface d'indication visuelle étant destinée à être tournée vers un automobiliste,
• des moyens d'émission sans fil de signaux codant l'information de signalisation routière,
  le panneau étant caractérisé en ce qu'il comporte en outre
• un moyen de réception sans fil de signaux d'inhibition, et
• un moyen de commande relié au moyen de réception et aux moyens d'émission pour déclencher, lorsque des signaux d'inhibition sont présents sur le moyen de réception, l'arrêt des moyens d'émission afin qu'au moins temporairement ces derniers n'émettent plus lesdits signaux codant l'information de signalisation routière.

A third object of the invention is a road sign, for the implementation of the method, the panel comprising

• a visual indication surface of a traffic signal information, the visual indication surface being intended to be turned towards a motorist,
• means for wireless transmission of signals encoding the traffic signaling information,
  the panel being characterized in that it further comprises
• means for wireless reception of muting signals, and
• control means connected to the receiving means and the transmitting means for triggering, when inhibiting signals are present on the receiving means, stopping the transmitting means so that at least temporarily these means further transmit said signals encoding the traffic signaling information.

This panel is for example portable.

A fourth object of the invention is a module intended to be mounted on a motor vehicle, for the implementation of the method described above, the module comprising
a receiver, able to receive, in a wireless reception mode, transmitted signals coding road signaling information,
characterized in that
the receiver is associated with a wireless transmitter, capable of transmitting signals encoding the traffic signal information contained in the signals received by the receiver, to another receiver of another motor vehicle rolling on the roadway and following the first motor vehicle.

A fifth object of the invention is a motor vehicle, comprising the module described above.

• la figure 1 est un schéma du déroulement du procédé suivant des premier et deuxième modes de réalisation suivant l'invention,
• la figure 2 est un synoptique d'une unité électronique d'émission, prévue sur le panneau,
• la figure 3 est un synoptique d'un module d'émission-réception prévu sur un véhicule,
• la figure 4 est un synoptique de fonctions prévues sur le véhicule automobile,
• la figure 5 représente schématiquement en vue de face et en vue de dessus un premier exemple de réalisation d'un panneau suivant l'invention,
• la figure 6 représente schématiquement en vue de face et en vue de dessus un deuxième exemple de réalisation d'un panneau suivant l'invention,
• la figure 7 représente le format des données de signaux émis par le panneau,
• la figure 8 représente le format des données de signaux émis par de module de véhicule vers un autre module d'un autre véhicule,
• la figure 9 représente le format des données de signaux émis par un module de véhicule vers le panneau, et
• la figure 10 est un synoptique d'autres fonctions pouvant être prévues sur un véhicule.

The invention will be better understood on reading the description which follows, given solely by way of non-limiting example with reference to the accompanying drawings, in which:

• FIG. 1 is a diagram of the progress of the method according to the first and second embodiments according to the invention,
• FIG. 2 is a block diagram of an electronic transmission unit, provided on the panel,
• FIG. 3 is a block diagram of a transmission-reception module provided on a vehicle,
• FIG. 4 is a block diagram of functions provided on the motor vehicle,
• FIG. 5 schematically represents a front view and a top view of a first embodiment of a panel according to the invention,
• FIG. 6 schematically represents a front view and a top view of a second embodiment of a panel according to the invention;
• FIG. 7 represents the format of the data of signals emitted by the panel,
• FIG. 8 represents the format of the data of signals transmitted by the vehicle module to another module of another vehicle,
• FIG. 9 represents the format of the signal data transmitted by a vehicle module towards the panel, and
• Figure 10 is a block diagram of other functions that can be provided on a vehicle.

In FIG. 1, a road traffic sign 1 has a front surface 2 for indicating or displaying a visual display of traffic signal information, which is turned towards the road and towards the motorists who use it when the sign is arranged. on the roadway or at the edge of it. The surface 2 is therefore turned forward, that is to say against the direction of movement of motorists to see the panel, this direction of movement is therefore from front to rear and being represented by arrows on the vehicles A1, A2, A3 in Figure 1. This surface 2 is for example formed by a plate having a contour of the form prescribed by the road signs carried by the panel, for example round for a panel of speed limitation, triangular for a danger sign, or others.

The panel 1 can be fixed permanently on the ground by a post 3 or be portable and be placed vertically on the ground by a self-locking foot or a pedestal 16 profiled and stable, having for example in this case a profiled handle to the back of the panel.

As can be seen in FIGS. 5 and 6, the panel 1 consists for example of a housing comprising the front face 2 accommodating the visual signaling film of type A, B, AK or the like, a sealed box 13 containing the unit 4, a cover 14 sealingly covering by a seal the pole assembly 3 fastening, fixing rails and the box 13. The cover may comprise at the rear an electrical outlet for the external power supply of the unit 4 in energy and two outputs reserved for the exchange of information with unit 4 from the outside. The panel housing can also incorporate, according to particular embodiments, a solar cell for the power supply of the unit 4, and / or an electricity supply battery of the unit 4 and / or a socket used for programming the unit 4. The antenna 7 of the unit 4 can be integrated or remote with respect thereto.

The panel 1 further comprises an electronic unit 4 for wireless transmission of signals to the roadway. The electronic unit 4 is fixed for example to the rear of the surface 2 or the post or the base carrying it.

The electronic unit 4 of the panel 1 comprises means for wireless transmission of first signals S1 to the roadway, when the panel is used to provide its signaling information to motorists passing in front.

For example, the unit 4 of the panel 1 comprises for this purpose in FIG. 2 a transceiver 6 provided with a transmitting-receiving antenna 7, the transmitter being designated by the reference sign 6a and the receiver being designated by the reference sign 6b. The signals transmitted and received on the antenna 7 are for example in the UHF frequency band and for example at 433 MHz, 868 MHz or 2.4 GHz or more precisely 2.445 GHz, the latter frequency being reserved for road safety. The antenna 7 is for example omnidirectional or direction to turn its emission lobe towards motor vehicles driving near the panel on the roadway, when the panel is used on it. The antenna 7 is for example direction towards the front of the panel 1.

The transceiver 6 is connected to a radio packet control and management stage sent to the transmitter 6a or received from the receiver 6b, this stage 8 being itself connected to a control means 9, for example formed by a microprocessor provided with a flash memory 10 and an SRAM memory 11. The control means 9 controls the generation of the first signals S1 by the stage 8 for transmission by the transceiver 6. The microprocessor is for example of the RISC type with a low oscillator frequency. The transceiver 6 works for example in ASK modulation or demodulation or FSK.

The first signals S1 emitted by the transmitter 6a carry the traffic signal information IL, which is the one present on the visual indication surface 2 of the panel 1 and which is for example stored beforehand in the memory 10 and / or 11 during the programming of the microprocessor 9. Of course, other messages to be transmitted by the transceiver 6 can be stored in the memory 10 and / or 11.

For example, for a speed limitation panel 1, whose surface 2 is round and indicates the number of kilometers / hour at which the speed is limited, for example "50" for a limitation at 50 km / h, the first signals S1 Issued includes IL information indicating speed limitation at 50 km / h.

• un code I0 du type d'informations à émettre, indiquant par exemple le niveau de priorité de celles-ci,
• un code I1, I2, I3, I4, I5 d'identifiant du panneau émetteur, contenant par exemple le numéro du panneau, la nature de la route sur laquelle il se trouve et la direction de circulation sur la route,
• un code I6, I7, I8, I9, I10 du type du panneau émetteur comprenant l'appellation normalisée de celui-ci avec un élément d'information de réserve pour d'autres applications, ce code étant utilisé par exemple pour la maintenance et le suivi de l'unité 4,
• un code I11 de vitesse, qui n'est pas utilisé dans le cas du panneau émetteur,
• un code I12, I13 de configuration, qui sera expliqué ci-après,
• un code I14, I15, I16, I17 du pays, servant par exemple à sélectionner la langue utilisée, qui sera expliqué ci-après.

The first signals S1 emitted by the transceiver 6 have, for example, the format of the data I0 to I17 represented in FIG. 7, comprising:

• a code I0 of the type of information to be sent, indicating for example the priority level thereof,
• an identifier code I1, I2, I3, I4, I5 of the transmitting panel, containing for example the number of the panel, the nature of the road on which it is located and the direction of traffic on the road,
• a code I6, I7, I8, I9, I10 of the type of the transmitting panel including the standardized name of the latter with a reserve information element for other applications, this code being used for example for maintenance and followed by unit 4,
• a speed code I11, which is not used in the case of the transmitter panel,
• a configuration code I12, I13, which will be explained below,
• a code I14, I15, I16, I17 of the country, for example to select the language used, which will be explained below.

The signaling information IL is present in the panel type code I6, I7, I8, I9, I10, for example in I9 and I10 and / or in the configuration code I12, I13. The code I9, I10 is, for example, the road sign code of the sign, such as BK14 or BK33 for a speed limit sign at 50 km / h, whereas the code I12, I13 contains the information IL of road restriction coded by 'another way.

Each data I0 to I17 is for example a byte.

First, second and third motor vehicles A1, A2, A3, rolling on the road by following and passing successively in front of the panel 1, each comprise a module 100, 200, 300 respectively having a transceiver 121-122, 221- 222 and 321-322. Each receiver 122, 222, 322 of the vehicles A1, A2, A3 is able to receive and decode the first signals S1 transmitted by the transceiver 6 of the panel 1 and the second signals S2 coding the traffic signal information IL, which will be described below. For this purpose, the antenna 7 of the transceiver 6 of the panel 1 has a determined range on the roadway, in front and possibly also behind the panel, this range being for example at least 100 meters or so.

In a similar manner to the transceiver 6, the transceivers 121-122, 221-222 and 321-322 of the vehicles each comprise a transmitting-receiving antenna, respectively 123, 223 and 323.

The motor vehicles A1, A2, A3 each comprise means for exploiting the information IL contained in the signals received by their receiver 122, 222, 322. The modules 100, 200, 300 of the vehicles are for example of the type shown in FIG. FIG. 3 for the vehicle A1, which comprises, in a manner analogous to the unit 4, a stage 124 for controlling and managing the radio packets and a control means 125 formed by a microprocessor provided with a flash memory 126 and an SRAM 127.

The control means 125 is furthermore connected to a device 128 for presenting information to the driver of the motor vehicle A1 and / or to the persons present therein. This device 128 comprises, for example, one or more sound output speakers 129 and / or a display screen 130 or a light-emitting diode or other display.

The information IL contained in the first signals S1 or in second signals S2 received by the transmitter 121 is extracted by the microprocessor 125 via the stage 124 to be then sent to the device 128, which returns it to the driver of the vehicle by the or the loudspeakers 129 and / or the screen 130. Thus, in the preceding example, the speed limitation information IL at 50 km / h is extracted from the first signals S1 received by the transmitter 121 and is restored. on the screen 130 in the form of the image of the corresponding panel, as shown in Figure 3. The driver thus has in his vehicle IL traffic signal information.

In a first embodiment, when the first receiver 122 has received the first signals S1 containing the traffic signal information IL, its associated transmitter 121 remotely retransmits the second signals S2 containing this traffic signal information IL present in or determined from the information contained in the first signals S1 received from the panel 1. The receiver 222 of the vehicle A2 according to the vehicle A1 is able to receive and decode the second signals S2 emitted by the transmitter 121 of the first vehicle A1. For this purpose, the transmit / receive antenna, respectively 123, 223 and 323, has a sufficient range and is determined forward and backward in the direction of traffic of the vehicle on the roadway.

The signaling information IL is then extracted from the second signals S2 received by the receiver 222, to be exploited in a manner similar to that described above for the first vehicle A1, and thus for example be returned to the driver by an information presentation device.

In turn, the transmitter 221 of the second vehicle A2 re-transmits the second signal S2 containing the traffic signal information IL received by its associated receiver 222, to the vehicle A3 succeeding it on the roadway. The receiver 322 of the vehicle A3 receives the signals S2 retransmitted by the transmitter 221 of the vehicle A2, extracting from them the traffic signal information IL, which is then used in the vehicle A3, for example to be returned to the driver and is re-issued by the transmitter 321 to the vehicle succeeding on the roadway to the vehicle A3.

The traffic signal information IL is thus wirelessly transmitted from the panel 1 to the first vehicle A1 and then from the vehicle in a vehicle succeeding one another on the roadway. Consequently, the driver of the second vehicle A2 can take cognizance of the traffic signal information IL which is returned to him in this vehicle A2, even if he does not yet visually distinguish the panel 1, because it is still too much distant. Consequently, the signaling information IL is received by the vehicles much further than by the simple range of the antenna 7 of the panel 1. The vehicles A2 and A3 are therefore informed much earlier of the signaling information IL. panel 1. In the case of speed limiting information IL, the second vehicle A2 follows the first vehicle A1, but is warned by it of the speed limitation information, which causes the second vehicle A2 to slow down and maintain or increase its safety distance from the first vehicle A1. Thus, in the case where the panel 1 is present on the roadway because of work or an accident on the roadway, the information IL of speed limitation is returned in the first vehicle A1 to its driver, which the encourages the braking, but the second vehicle A2 the following also receives the speed limit information early enough, which also encourages it to brake and helps prevent the accident that would be due to sudden braking of the vehicle A1.

In a second embodiment, the transmission of the second signals S2 described above, containing the traffic signal information IL, by the transmitter 121 is subordinated to the reception by its associated receiver 122 of an acknowledgment of receipt. S4 'of the transmitter 221 of the next vehicle.

In this second embodiment, when the first receiver 122 has received the first signals S1 containing the traffic signal information IL, its associated transmitter 121 wirelessly transmits preliminary interrogation signals S4 to determine whether there is a receiver 122. of a vehicle A2 according to the vehicle A1 in their direction of traffic on the roadway, to which the vehicle A1 can establish a link for transmitting second signals S2 containing the traffic signal information IL. The interrogation signals S4 are, for example, a frame having a small data volume, smaller than that of the signals S1, S2, S3, indicate, for example, the characteristics that the connection with the transmitter 121 will have to serve, to prevent errors. receiving or transmitting and configuring the connection between the transmitter 121 and the receiver 222.

When the second receiver 222 has received the interrogation signals S4 from the first transmitter 121, it optionally verifies whether the binding characteristics contained therein correspond to it and, if so, or if it does not carry out such a verification, controls the transmission by the second associated transmitter 221 of the acknowledgment S4 'of the interrogation signal S4 to the first receiver 122. When the first receiver 122 has received this acknowledgment S4 ', the first associated transmitter 121 retransmits the second signal S2 containing the traffic signal information IL that has been received by this receiver 122, in a manner similar to that described in FIG. the first embodiment above. This second signal S2 containing the traffic signal information IL is then received by the receiver 222 which for example then operates it in accordance with what has been previously described for the vehicles.

Where appropriate, according to the mode of operation of each vehicle transceiver, the process of transmitting the traffic signaling information IL according to the second embodiment can be implemented also by the second transceiver 221-222. of the second vehicle A2 for transmitting the signals S2 containing the traffic signal information IL to the third receiver 322, as shown in FIG. 1. The successive transmissions of the vehicle in the vehicle S2 signals containing the traffic signal information IL. can implement the first embodiment or the second embodiment, according to the mode of operation of each transceiver.

In an improvement, the braking of a vehicle A1, A2, A3 following the reception by this vehicle of the traffic signal information IL is monitored by a control means provided on this vehicle (for example provided on the module 100 , 200, 300 or the CAL calculator) to trigger in the event of detection of such braking, the control of the hazard warning lights of the vehicle, in order to attract the attention of the drivers of the following vehicles.

According to another improvement, the traffic signal information IL contains speed limitation information at a prescribed speed. A control means (for example provided on the module 100, 200, 300 or the calculator CAL) provided on the vehicle having received the information IL of speed limitation monitors the actual speed of displacement thereof, measured for example at using a sensor embarked on this vehicle. In the case where the control means determines that the actual speed of movement of the vehicle is greater than that indicated by the speed limiting information IL, it triggers the activation of the vehicle hazard warning lights.

On the vehicles A1, A2, A3, the module 100, 200, 300 may also be associated with or comprise a direction detection unit MDSC, a distance calculator DDC, an AS signal adapter providing a measurement of the actual speed of the vehicle, an LCD 130 or other LCD screen of the device 128, an audio processing system STA, which is connected to an audio terminal TA (record player and / or radio, for example of the car radio type) and to the sound output SP speakers of the audio terminal TA, forming the loudspeakers 129 of the device 128, as shown in FIG. 4.

If the module 100, 200, 300 determines that the real speed of the vehicle supplied to it is greater than the speed limiting information IL received by the receiver 122, 222, 322 of this module, it will cause, via the STA system , the passage of a sound announcement on the speakers SP, possibly instead of what the audio terminal TA is sending them. In this case, the audible announcement will be of increasing intensity and will loop as long as the measured vehicle speed is higher than that indicated by the speed limitation information. Simultaneously, the image of the panel 1 will be displayed on the screen 130 and will remain displayed until further order of the module.

If the module 100, 200, 300 determines that the actual speed of the vehicle supplied to it is not greater than the speed limiting information received by the receiver 122, 222, 322 of that module, it will not cause the passage of the sound announcement but simply the display on the screen 130.

One or more of the vehicles A1, A2, A3 may also include a limiter or an automatic speed controller, connected to the module 100, 200, 300, for example by a CAN computer bus. When the IL traffic signal information received by the receiver 122, 222, 322 of the vehicle A1, A2, A3 is a speed limiting information IL, this limiter or regulator is controlled by the means 125 so that the value of the maximum speed imposed by it on the vehicle is if necessary reduced to this speed limitation information, for example 50 km / h in the previous example. It can be expected that this automatic speed limiter control is invalidated on the vehicle by a sudden actuation of the accelerator pedal by the driver, this invalidation ceasing when it stops, so that the speed limiter resumes the previous operation.

This speed limiter command is for example not executed on the first vehicle A1 but is executed on one or more of the vehicles A2, A3 which follow the first vehicle A1 having received from the panel 1 the information IL of limitation of speed.

Below is described in FIG. 10 an improvement in the case where one or more of the vehicles A1, A2, A3 does not comprise a limiter, nor an automatic speed-of-displacement regulator, but comprises a CAL calculator, receiving on inputs of the measured variables of the vehicle parameters, comprising a magnitude VA of the position of the accelerator or the accelerator pedal PA of the vehicle and a variable VV of the real speed of the vehicle, and providing on outputs, for example borrowing the CAN bus, information, comprising for the magnitude VA an acceleration information IA to be sent to the throttle valve PG of the vehicle to control its position and for the magnitude VV of the real speed of the vehicle a real speed information IV sent by example to the board TB of the vehicle for indication to the person driving it.

The variable VA of the position of the accelerator is, for example, an electric voltage VA supplied by an ac position sensor of the accelerator PA, for example in the form of a potentiometer whose position of the midpoint with respect to the terminals of the accelerator. end is modified by the rotation of a PO pulley around which passes a CCA cable connected to and actuated by the accelerator PA. The magnitude W of the actual speed of the vehicle is measured for example by a CV sensor real speed of the vehicle, provided on a wheel R thereof.

In the example of FIG. 10, the calculator CAL or another distinct means monitors the information IV of real speed which has been determined by the calculator CAL from the magnitude W of real speed so that, temporarily, the throttle valve PG is not controlled by the acceleration information IA, if, in a first case, this monitoring means has determined that the actual speed information IV indicates a real vehicle speed greater than that indicated by the information IL of speed limitation received by the receiver thereof. Thus, the vehicle will not be able to increase its speed which already exceeds the maximum speed provided by the speed limit sign, even if the person driving the vehicle operates the accelerator.

On the other hand, if, in a second case, the monitoring means has determined that the actual speed information IV indicates a real vehicle speed less than or equal to that indicated by the speed limitation information IL or in the absence thereof IL speed limiting information, the throttle valve PG remains controlled by the acceleration information IA which is transmitted to it from the CAL calculator.

The absence of control of the throttle valve PG by the acceleration information IA in the first case is caused, for example, by the fact that this acceleration information IA is not transmitted from the calculator CAL to this throttle valve PG . This lack of control throttle PG gas is for example accompanied by a hardening of the accelerator to encourage the driver of the vehicle not to actuate.

For example, the speed limiting information IL controls the speed limiter or the speed regulator, or causes a lack of control of the throttle valve PG in the first case above for a code 10, J0, K0 of priority sufficiently high in the signals S1, S2, S3.

• un code J0 analogue au code I0 décrit ci-dessus,
• un code J1, J2, J3, J4, J5 d'identifiant de module de véhicule émetteur et par exemple de la carte du module émetteur dans le cas où celui-ci est mis en oeuvre à l'aide d'une carte électronique,
• un code J6, J7, J8, J9, J10 du type de panneau émetteur, qui est analogue au code I6, I7, I8, I9, I10 décrit ci-dessus et qui permet d'identifier le panneau émetteur,
• un code J11 de vitesse, indiquant la vitesse réelle du véhicule sur lequel se trouve le module émetteur, cette vitesse étant mesurée par des moyens appropriés sur le véhicule,
• un code J12, J13, J14, J15 de configuration contenant l'information IL de signalisation routière, par exemple de limitation de vitesse dans l'exemple précédent,
• un code J16, J17 de réserve pour d'autres applications.

The second signals S2 emitted from vehicle modules into vehicle modules have, for example, the format of the data J0 to J17 represented in FIG. 8, comprising:

• a code J0 similar to the code I0 described above,
• a code J1, J2, J3, J4, J5 transmitting vehicle module identifier and for example the transmitter module card in the case where it is implemented using an electronic card,
• a code J6, J7, J8, J9, J10 of the type of transmitter panel, which is similar to the code I6, I7, I8, I9, I10 described above and which makes it possible to identify the transmitting panel,
• a speed code J11, indicating the real speed of the vehicle on which the transmitter module is located, this speed being measured by appropriate means on the vehicle,
• a configuration code J12, J13, J14, J15 containing the traffic signal information IL, for example of speed limitation in the preceding example,
• J16 code, J17 reserve for other applications.

The transmitter 121 of the first vehicle A1 stops transmitting the second signals S2 when it has detected that its associated receiver 122 has received the signals S2 from another vehicle A2 with the same panel type code J6, J7, J8, J9, J10 and with the same parameters as the signal S2 transmitted by the transmitter 121.

In addition, when the second vehicle A2 passes close to the panel 1, its receiver 222 receives the first signal S1 containing the traffic signal information IL from the transmitter 6a of this panel 1, while it has already received of the transmitter 121 of the first vehicle A1 the second signal S2 containing the same traffic signal information IL, which it recognizes the source of this transmitter 121 by the code J1, J2, J3, J4, J5. The identity of the traffic signal information IL contained in the first and second signals S1 and S2 is detected in the modules by the fact that the panel type code J6, J7, J8, J9, J10 of the second signal S2 is identical to the type code of panel I6, I7, I8, I9, I10 of the first signal S1. In the case of such a detection, the module 200 of the second vehicle A2 ignores the traffic signal information IL contained in the first signal S1 received from the panel 1, which it recognizes by the code I1, I2, I3, I4, I5 indicating their emission by the panel 1. It is the same for the vehicle A3 instead of the vehicle A2.

When the receiver 122 of the first vehicle A1 has received from the transmitter 6a of the panel 1 the first signal S1 containing the traffic signal information IL, the transmitter 121 associated with it is automatically controlled to emit a third signal S3 of muting or muting the transmitter 6a of the panel 1.

When the receiver 6b has received third inhibition signals S3, it triggers the temporary stopping of the transmission of the first signals S1 containing the signaling information IL by the emitter 6a of the panel 1.

This temporary stop is caused, for example, by the fact that the control means 9 detects the presence of the third inhibition signal S3 on the receiver 6b and stops the sending of the traffic signal information IL to the transmitter 6a and the antenna 7. It follows that the transmitter 6a of the panel 1 is temporarily stopped and no longer radiates electromagnetic waves through its antenna 7 to the outside, which makes it consume much less energy than S1 signal transmission case. Thus, for a unit 4 powered at 3.3 V, the consumed current is between 7 and 15 mA when S1 signals are transmitted and is reduced to 2 mA during transmission pauses. The temporary shutdown of the transmitter 6a is for example prescribed in the control means 9 for a predetermined time, for example a few seconds, so that the transmission of the first signals S1 by the transmitter 6a then resume. In the absence of muting signals S3 received, the transmitter 6a transmits the first signals S1 loop.

Thus, the emitter 6a of the panel 1 needs to be supplied with energy only intermittently, when no vehicle is in the vicinity of the panel 1. However, the range of the transmission of the signaling information IL is not diminished and is even increased by the fact that it is transmitted from the transmitter 6a to the module 100 of the first vehicle A1 located in the radiation range of the antenna 7, and from there vehicle in front of the vehicle 1, as described above.

• un code K0 de type, analogue au code J0 décrit ci-dessus,
• un code K1, K2, K3, K4, K5 d'identifiant du module de véhicule émetteur, analogue aux codes d'identifiant J1, J2, J3, J4, J5 décrits ci-dessus,
• un code K6, K7, K8, K9, K10 identifiant le panneau destinataire du signal d'inhibition, qui est donc un code analogue aux codes I6 à I10 ou J6 à J10 décrits ci-dessus,
• un code K11 analogue au code J11 décrit ci-dessus,
• un code K12, K13, K14, K15 de configuration contenant l'instruction d'inhibition proprement dite du panneau destinataire,
• un code K16, K17 analogue aux codes J16, J17 décrits ci-dessus.

The inhibition signal S3 emitted by a vehicle transmitter module has, for example, the format of the data K0 to K17 represented in FIG. 9, comprising:

• a code K0 of type, similar to code J0 described above,
• a code K1, K2, K3, K4, K5 identifier of the transmitting vehicle module, similar to the identifier codes J1, J2, J3, J4, J5 described above,
• a code K6, K7, K8, K9, K10 identifying the target panel of the inhibition signal, which is therefore a code similar to the codes I6 to I10 or J6 to J10 described above,
• a code K11 analogous to the code J11 described above,
• a configuration code K12, K13, K14, K15 containing the actual inhibition instruction of the destination panel,
• a code K16, K17 analogous to codes J16, J17 described above.

On the panel can be provided according to the case a solar cell power supply with buffer battery to replace the solar cell during periods of very low illumination.

Alternatively, the unit 4 of the panel 1 can be supplied with electricity by radio waves emitted by the vehicle A1. In this variant, the transmitter 6a transmits the signals S1 only when the vehicle A1 requests it, that is to say when it transmits permanent radio waves for the supply of panels and approaches the panel 1. After decoding and control of the radio signals thus received from the vehicle A1, which contain both the necessary power supply, the vehicle code and the orientation of the module 100, the unit 4 transmits the signals S1 and then ceases. issue.

The presentation of the traffic signal information IL by the device 128 in the vehicles is for example adapted according to the country code I14, I15, I16, I17 present in the signal S1 received from the panel 1 by the vehicle module, for example to cause a display on the screen 130 and a sound output on the loudspeaker (s) 129 in a language selected, which may be different from the language of the country where the panel is located.

Claims (19)

Method for signaling on board a motor vehicle, in which signals (S1) encoding traffic signal information (IL) are transmitted wirelessly to the roadway by transmission means (6a) provided on a panel (1) signaling signals and are received by a first receiver (122) of a first motor vehicle (A1) rolling on the roadway,
characterized in that
the first receiver (122) of the first motor vehicle (A1) is associated therewith with a first transmitter (121), which wirelessly transmits signals (S4, S2) to a second motor vehicle (A2) on the roadway and following the first motor vehicle (A1), for transmission to a second receiver (222) of the second motor vehicle (A2), the traffic signal information (IL) contained in the signals (S1) received by the first receiver (122), the information (IL) of road signaling transmitted being intended to be operated on at least one of said vehicles. Process according to Claim 1, characterized in that
when the first receiver (122) has received said signals (S1) encoding the traffic signal information (IL), the associated first transmitter (121) automatically wirelessly transmits said presence interrogation signals (S4) of the second receiver ( 222) of the second motor vehicle (A2) rolling on the roadway and following the first motor vehicle (A1), and
in the event of reception of said interrogation signals (S4) by the second receiver (222) of the second motor vehicle (A2) rolling on the roadway and following the first motor vehicle (A1), a second transmitter (221) associated with the second motor vehicle (A2) to the second receiver (222) transmits wirelessly to the first receiver (122) an acknowledgment (S4 ') for receiving said interrogation signals (S4), which triggers the wireless transmission by the first transmitter (121). ) of signals (S2) encoding the traffic signal information (IL) contained in the signals (S1) received by the first receiver (122) to the second receiver (222) of the second motor vehicle (A2). Process according to Claim 1, characterized in that
when the first receiver (122) has received said signals (S1) encoding the traffic signal information (IL), the associated first transmitter (121) automatically wirelessly transmits said signals (S2) encoding the signaling information (IL). signal contained in the signals (S1) received by the first receiver (122) to the second receiver (222) of the second motor vehicle (A2). Method according to one of the preceding claims, characterized in that the second receiver (222) of the second motor vehicle (A2) is associated therewith with a second transmitter (221) which, when the second receiver (222) received the traffic signal information (IL) contained in the signals (S1) received by the first receiver (122), wirelessly transmits signals (S4, S2) to a third motor vehicle (A3) running on the roadway and following the second motor vehicle (A2), for the purpose of transmitting to a third receiver (322) of the third motor vehicle (A3), the traffic signaling information (IL) transmitted to the second receiver (222), the traffic signaling information (IL) transmitted being intended to be exploited on at least one of said vehicles. Process according to Claim 4, characterized in that
when the second receiver (222) has received the traffic signaling information (IL) contained in the signals (S1) received by the first receiver (122), the associated second transmitter (221) automatically wirelessly transmits said signals (S4) interrogating the presence of the third receiver (322) of the third motor vehicle (A3) traveling on the roadway and following the second motor vehicle (A2), and
in the event of reception of said interrogation signals (S4) by the third receiver (322) of the third motor vehicle (A3) traveling on the roadway and following the second motor vehicle (A2), a third transmitter (321) associated on the third motor vehicle (A2) to the third receiver (322) wirelessly transmits to the second receiver (122) an acknowledgment (S4 ') of reception said interrogation signals (S4), which triggers the wireless transmission by the second signal transmitter (221) encoding the traffic signal information (IL) contained in the signals (S2) received by the second receiver (222) to the third receiver (222) of the third motor vehicle (A3). Process according to Claim 4, characterized in that
when the second receiver (222) has received the traffic signaling information (IL) contained in the signals (S1) received by the first receiver (122), the associated second transmitter (221) automatically wirelessly transmits said signals (S2) encoding the traffic signal information (IL) contained in the signals (S2) received by the second receiver (222) to the third receiver (222) of the third motor vehicle (A3). Method according to one of the preceding claims, characterized in that
at least one of said motor vehicles (A1, A2, A3) comprises an automatic speed limiter that is set by a maximum speed value,
the traffic signal information (IL) contains speed limiting information (IL) at a prescribed value,
a step of controlling the speed limiter is carried out on said determined motor vehicle, during which the reception, by the receiver (122, 222, 322) of said determined motor vehicle, of the information (IL) of speed limitation contained in the signals (S1) received by the first receiver (122) automatically triggers the command of its speed limiter to the maximum speed value prescribed by this speed limiting information (IL). Process according to any one of claims 1 to 6,
characterized in that
on at least one of said motor vehicles (A1, A2, A3), the throttle valve (PG) is controlled by an acceleration information (IA), which is determined by a calculator (CAL) from the position of the accelerator (PA) of the vehicle,
the traffic signal information (IL) contains speed limiting information (IL) at a prescribed value,
a real velocity value (IV) measured on the vehicle is monitored so that, temporarily, the control of the throttle (PG) of this vehicle by the acceleration information (IA) is inhibited if it has been determined that the value (IV) of the actual speed of movement of the vehicle is greater than that indicated by the information (IL) of speed limitation. Method according to one of the preceding claims, characterized in that
the transmitter (121) of a vehicle (A1) stops transmitting the signals (S2) for transmission of the traffic signaling information (IL), after it has been detected that its first associated receiver ( 122) has received, from the transmitter (222) of another vehicle, signals (S2) coding the traffic signal information (IL) and having the same code (J6, J7, J8, J9, J10 ) than that of the signals (S2) that this first transmitter (121) has emitted. Method according to one of the preceding claims, characterized in that
when the receiver (122, 222, 322) of at least one of said motor vehicles (A1, A2, A3) has received the traffic signaling information (IL) contained in the signals (S1) received by the first receiver (122), this information (IL) of road signs is returned by means (128) of information presentation to the driver of this vehicle. Method according to any one of the preceding claims, characterized in that the receiver (222, 322) having received from said transmitter (121, 221) the traffic signaling information (IL) contained in the signals (S1) received by the first receiver (122) ignores others signals (S1) coding the traffic signal information (IL) that it receives, in the event that it detects that these other signals (S1) encoding the traffic signal information (IL) contain a code (I1, I2, I3, I4, I5) indicating their emission by the panel (1). Method according to one of the preceding claims, characterized in that , when the receiver (122, 222, 322) of one of said vehicles (A1, A2, A3) receives traffic signal information (IL). , the braking of this vehicle (A1, A2, A3) is monitored by a control means provided on this vehicle to trigger, in the event of detection of such braking, the actuation of the hazard warning lights of the vehicle. Method according to one of the preceding claims, characterized in that
in response to the reception by the first receiver (122) of the signals (S1) encoding the traffic signal information (IL), the first transmitter (121) further retransmits wirelessly signals (S3) for inhibition to the panel (1),
receiving, by means of reception means (6b) of the panel (1), muting signals (S3) emitted, triggering the at least temporary stopping of the transmission of the signals (S1) encoding the information (IL) of road signs by the emission means (6a) of the panel (1). Process according to Claim 13, characterized in that
each motor vehicle (A1, A2, A3) equipped with a signal receiver (122, 222, 322) (S1, S2) encoding the traffic signal information (IL) is provided with means (128) for operating on the vehicle (A1, A2, A3) the traffic signal information (IL) contained in the signals (S1, S2) received by this receiver, as well as an associated transmitter (121, 221, 321), which retransmits wirelessly signals (S2) encoding the traffic signal information (IL) contained in the signals (S1, S2) received by this receiver to a receiver of another motor vehicle traveling on the roadway and the third signals (S3 ) inhibition to the panel (1). Device for implementing the signaling method on board a motor vehicle according to any one of the preceding claims, comprising: a sign (1) for road signs to the roadway, comprising means (6a) for transmitting wirelessly to the signal path (S1) encoding a signaling information (IL), - a first receiver (122) of the first signals (S1) issued, which is intended to be mounted on board a first motor vehicle (A1) rolling on the road, characterized in that
the first receiver (122) of the first motor vehicle (A1) is associated therewith with a first wireless transmitter (121) capable of transmitting signals (S2, S4) encoding the traffic signal information (IL) contained in the signals (S1) received by the first receiver (122), to a second receiver (222) of a second motor vehicle (A2) traveling on the road and following the first motor vehicle (A1), a means operating information (IL) of road signs being provided to be mounted on board at least one of said vehicles. Road sign, for carrying out the method according to claim 13 or 14, the panel (1) comprising a surface (2) for visually indicating a traffic signaling information, the visual indication surface (2) being intended to be turned towards a motorist, means (6a) for wireless transmission of signals (S1) encoding the traffic signal information (IL),
the panel being characterized in that it further comprises means (6b) for wireless reception of muting signals (S3), and control means (9) connected to the reception means (6b) and to the transmission means (6a) for triggering, when inhibition signals (S3) are present on the reception means (6b), stopping the transmission means (6a) so that at least temporarily these latter do not emit said signals (S1) encoding the information (IL) of road signs. Panel according to claim 16, characterized in that it is portable. Module (100, 200, 300) intended to be mounted on a motor vehicle, for carrying out the method according to any one of Claims 1 to 14, the module (100, 200, 300) comprising
a receiver (122, 222, 322) adapted to receive, in a wireless reception mode, transmitted signals (S1, S2) encoding a traffic signal information (IL),
characterized in that
the receiver (122, 222, 322) is associated with a wireless transmitter (121, 221, 321) capable of transmitting signals (S2, S4) encoding the traffic signal information (IL) contained in the signals (S1 ) received by the receiver (122, 222, 322), to another receiver of another motor vehicle (A2) rolling on the road and following the first motor vehicle (A1). Motor vehicle, comprising a module according to claim 18.

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