JP2018172896A - Road surface reflecting type delineator device and road surface reflecting type delineator method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a road surface reflecting type delineator device and road surface reflecting type delineator method which allows a driver of a vehicle to clearly recognize a line sign even from a distance without increasing the output of a laser light source.SOLUTION: A road surface reflecting type delineator device 1 comprises: a laser light source 2 for irradiating a line shaped laser light 51 which projects a line sign 5 on a road surface; and a device body 3 for storing the laser light source. In a state where the device body is installed on a support body P with a fitting tool 4 and the line sign is on an outer line 6 or in the vicinity of the outer line, an optical axis 52 of the line shaped laser light is directed obliquely downward from above the outer side of the outer line and irradiated toward a direction opposite to a travelling direction of a vehicle so as to be projected along the length direction of the outer line at a position P3 shifted toward the direction opposite to the traveling direction of the vehicle from a road width direction just front position P2 of the device body installation position P1; allowing a vehicle driver to recognize the line sign by the reflected light of the line shaped laser light from the road surface.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a road surface reflection type visual guidance apparatus and a road surface reflection type visual guidance method that perform line marking by irradiating a line-shaped laser beam toward an outer line of a road.

  Conventionally, as a line-of-sight guidance device, an apparatus main body storing a laser light source for irradiating a line-shaped laser beam is installed on a support column standing beside a road, and the line-shaped laser light is directed downward from above by this apparatus main body. There is one that causes the vehicle driver to recognize the outside line of the road even when the visibility is impaired such as when there is snow by performing line marking along the outside line of the road (Patent Document 1).

Japanese Patent Application No. 2006-221617

  The vehicle driver can recognize the line marking by the line-of-sight guidance device mainly by the reflected light from the road surface of the line laser beam. Since laser light is superior in directivity and convergence of light compared to LED light, when the line laser light is irradiated from above to the road surface below, the reflected light of the line laser light reflected on the road surface The amount of reflected light in the lateral direction toward the vehicle driver is reduced. For this reason, when the line laser beam is irradiated so that the center position of the line marking is positioned in front of the apparatus main body installation position in the road width direction, for example, the vehicle driver (of the line marking of several tens of meters) from the line marking position. The vehicle driver facing the projection position in front may not be able to clearly recognize the line marking because it is dark. In this case, it is conceivable to increase the output of the laser light source so that the vehicle driver can clearly recognize the line marking even from a distance. However, if the influence on the eyes of the vehicle driver is taken into consideration, the output of the laser light source is high. Is not preferable.

  The present invention has been made in view of the above circumstances, and is a road surface reflection type visual guidance apparatus that enables a vehicle driver to clearly recognize a line marking even from a distance without increasing the output of a laser light source. It is another object of the present invention to provide a road surface reflection type line-of-sight guidance method.

The road surface reflection type gaze guidance device according to the present invention is:
A laser light source that irradiates a line-shaped laser beam so that a line marking is projected on the road surface, and a laser light source that is stored at a predetermined height position of a support that stands outside the outer line of the road by a fixture A device body to be installed,
In the state where the apparatus main body is installed on the support by the fixture, the line marking is located on the outer line or in the vicinity of the outer line at a position deviated from the front position in the width direction of the apparatus main body installation position to the opposite side in the traveling direction of the vehicle. The optical axis of the line-shaped laser light is directed obliquely downward from the outside of the outside line and toward the opposite side of the traveling direction of the vehicle so that it is projected along the length direction of the outside line. The vehicle is recognized by the vehicle driver by the reflected light of the line laser beam from the road surface.
In addition, the road surface reflection type gaze guidance method according to the present invention includes:
Using a laser light source that irradiates a line laser beam so that the line mark is projected on the road surface, the line mark moves on the outer line or in the vicinity of the outer line from the front position in the width direction of the installation position of the laser light source. The optical axis of the line-shaped laser beam is directed obliquely downward from the outside of the outer line so as to be projected along the length direction of the outer line at a position shifted in the direction opposite to the direction, and the vehicle travels This is a method of irradiating toward the direction opposite to the direction and allowing the vehicle driver to recognize the line marking by the reflected light of the line-shaped laser light from the road surface.

Here, the outside line is a line that divides the road portion (roadway) through which the vehicle passes and the outside thereof, but the line is drawn not only when the line is drawn with paint, but also with the paint. It also includes the case of not (virtual line) The optical axis of the line laser beam is a straight line that connects the center point of the line laser beam emitted from the laser light source and the line mark center point. A vehicle driver who faces the projection position of the line marking forward recognizes the line marking mainly by the reflected light from the road surface of the line laser beam.
According to the above configuration of the present invention, the line marking is projected on or near the outer line at a position shifted from the front position in the width direction of the apparatus main body installation position (laser light source installation position) to the direction opposite to the traveling direction of the vehicle. Is done. The reflected light of the line-shaped laser beam reflected by the road surface at the projection position of the line marking is directed in the direction opposite to the traveling direction of the vehicle. Accordingly, it is possible to increase the amount of reflected light of the line-shaped laser light that travels from the projected position of the line marking toward the direction opposite to the traveling direction of the vehicle.

  According to the present invention, the reflected light of the line-shaped laser beam reflected by the road surface at the projection position of the line marking is directed toward the reverse direction side of the traveling direction of the vehicle, and the line-shaped laser beam toward the reverse direction side of the traveling direction of the vehicle is By increasing the amount of reflected light, a vehicle driver who faces the projected position of the line marking forward without increasing the output of the laser light source can make the line marking bright and clear from the reflected light of the line-shaped laser light even from a distance. Can be seen.

It is a perspective view showing the road surface reflection type gaze guidance device of an embodiment. It is a cross-sectional schematic diagram which shows the internal structure of an apparatus main body and a laser light source. It is a side view which shows the state which attached the apparatus main body to the support | pillar with the fixture. It is a figure which shows an attachment tool, the figure (A) is a top view, and the figure (B) is a side view. It is a schematic diagram which shows the irradiation direction of a line-shaped laser beam, The same figure (A) is a schematic diagram in the case of irradiating toward the reverse direction side of the advancing direction of a vehicle (B) is an apparatus. It is a schematic diagram in the case of irradiating the position directly in the width direction of the main body installation position. It is a figure which shows the angle of the irradiation direction of a line-shaped laser beam, The figure (A) is a top view seen from the top in order to show the angle of the left-right direction, The figure (B) is for showing the angle of an up-down direction It is the side view seen from the road width direction. It is an upper surface schematic diagram which shows the state which installed the laser light source in rotation angle (theta) in the case. It is a figure which shows the state which installed two laser light sources in rotation angle (theta) in the case, the figure (A) is a top schematic diagram, and the figure (B) is a cross-sectional schematic diagram.

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the road surface reflection type gaze guidance device 1 according to the embodiment is installed on a support (support) P standing outside the outer line 6 of the road 60, and is directed from the upper side to the lower road surface 61. The line marking 5 along the outer line 6 of the road 60 is projected by irradiating the line laser beam 51. Here, the outside line 6 is a line that divides the road 60 portion (roadway) through which the vehicle passes and the outside thereof. This includes the case where it is not drawn (virtual line).
As shown in FIG. 2, the road surface reflection type gaze guidance device 1 includes a laser light source 2 that irradiates a line-shaped laser beam 51 and an apparatus main body 3 in which the laser light source 2 is stored, as shown in FIG. 3. The apparatus main body 3 is installed at a predetermined height position of the column P by the fixture 4.

  As shown in FIG. 2, the laser light source 2 projects line markings 5 onto a surface to be irradiated (road surface 61) by irradiating a line-shaped laser beam. In the laser light source 2, a semiconductor laser element 22, an optical system unit (collimator lens 23, line beam conversion unit 24), and a circuit 25 for driving the semiconductor laser element 22 are stored in an elongated cylindrical housing 21. A laser beam emission port 26 is formed in a circular shape on the distal end surface (emission side end). A wiring 28 for power supply or the like is drawn out from the base end 27 of the laser light source 2. The laser light source 2 converts the laser light emitted from the semiconductor laser element 22 into parallel light by the collimator lens 23, converts the parallel light into the line-shaped laser light 51 by the line beam conversion unit 24, and converts the laser light into the laser light emission port 26. Irradiate from. The line beam conversion unit 24 can use various means such as a prism lens, a mirror, and a polarizing plate. The line-shaped laser light 51 emitted from the laser light source 2 is emitted at a predetermined emission angle β, and is irradiated in a triangular shape when viewed from the side as shown in FIG. The optical axis 52 of the line-shaped laser beam 51 is a straight line connecting the center point of the line-shaped laser beam 51 at the laser beam exit 26 in the laser light source 2 and the line center point of the line marking 5 projected onto the irradiated surface. It is.

  As shown in FIG. 2, the apparatus body 3 includes a rectangular box-shaped case 30, and a rectangular base plate 31 of the case 30 is provided with a window portion 32 for emitting line laser light 51 of the laser light source 2. It has been. In this case 30, the laser light source 2 is fixed in a rotation-prevented state around the cylinder axis of the laser light source 2 with the laser light emission port 26 facing the window portion 32 and standing on the inner surface of the bottom plate 31. The fixing method of the laser light source 2 in the case 30 is that an insertion portion is formed on the inner surface of the case 30 and a holder holding the laser light source 2 in a rotation-blocking state is inserted into the insertion portion and fixed. Without limitation, various means can be used.

  On the outer surface of the bottom plate 31, a pair of rectangular flat plate portions 33 (see also FIG. 3) extending downward are formed with the window portion 32 interposed therebetween. By this flange portion 33, the line-shaped laser beam 51 emitted from the window portion 32 is blinded so that it cannot be viewed directly from below. A bulging portion 34 that travels outward is formed on the upper side of two side plates that face one side of the four side plates of the case 30, and a bulging portion 34 is formed on the lower side of the bulging portion 34 from the side plate. A protruding piece 35 protruding outward is formed. A U-shaped band fitting 71 of the fixture 4 is disposed on the lower surface of the bulging portion 34.

  As shown in FIGS. 3 and 4, the mounting tool 4 includes a device mounting bracket 7 that holds the apparatus body 3, a column mounting bracket 8 that is mounted on the column P, and a device mounting bracket 7 and a column mounting bracket 8. A connecting fitting 9 that is connected so as to be adjustable in angle is provided.

  The device mounting bracket 7 is configured by attaching a U-shaped band bracket 71 to a U-shaped first plate bracket 72 with a nut 73, and the apparatus body 3 is disposed and fixed in the U-shaped band bracket 71. The U-shaped band fitting 71 is disposed on the lower surface of the bulging portion 34 of the case 30 of the apparatus main body 3, and is disposed between the lower surface of the one bulging portion 34 and the protruding piece 35. Thereby, the apparatus main body 3 is stably fixed to the fixture 4 so as not to fall in a fixed posture.

  The post mounting bracket 8 is configured by fixing a U-shaped support 83 for mounting the stainless band bracket 81 to a U-shaped second plate bracket 82 with bolts 85 and nuts 84 and fixing the stainless band bracket 81 to the column. Fit on P and fix. In addition, the column mounting bracket 8 is not only a column P standing upright but also a horizontal bar extending horizontally by fixing the stainless steel band bracket 81 to the second plate bracket 82 at 90 degrees. Also, the installation posture of the apparatus main body 3 can be fixed as it is.

  The connection fitting 9 has a pair of first connection pieces 91 connected to the first plate fitting 72 of the device attachment fitting 7 and a pair of second connection pieces 92 connected to the second plate fitting 82 of the column attachment fitting 8. The first connecting piece 91 and the second connecting piece 92 are shifted by 90 degrees and extend in opposite directions. The first plate fitting 72 and the first connecting piece 91 are connected by a bolt 93 and a nut 94. By rotating the first plate fitting 72 around the bolt 93 and the nut 94, the apparatus main body 3 is moved in the vertical direction. The angle can be adjusted freely. The second plate fitting 82 and the second connecting piece 92 are connected by a bolt 95 and a nut 96. By rotating the second plate fitting 82 around the bolt 95 and the nut 96, the apparatus main body 3 is moved in the left-right direction. The angle can be adjusted freely.

  Thus, the first plate fitting 72 and the first connecting piece 91 constitute an angle adjusting mechanism (vertical swing mechanism) in the vertical direction of the apparatus main body 3, and the second plate fitting 82 and the second connecting piece 92 are constituted by the apparatus main body. 3 left and right angle adjustment mechanisms (left and right swing mechanisms). Therefore, the attachment 4 can attach the apparatus main body 3 with respect to the support | pillar P so that angle adjustment is possible to the up-down direction and the left-right direction, respectively. By adjusting the angle of the apparatus main body 3 in the vertical direction, the swing width W from the apparatus main body installation position P1 in the road width direction can be set as the irradiation position of the line-shaped laser light 51 (see FIGS. 1 and 6). By adjusting the angle of the apparatus main body 3 in the left-right direction, the irradiation distance L from the apparatus main body installation position P1 to the road length direction orthogonal to the road width direction can be set as the irradiation position of the line-shaped laser light 51 (FIGS. 1 and 2). 6). The first plate fitting 72 and the first connecting piece 91, and the second plate fitting 82 and the second connecting piece 92 are provided with scales 97 and 98 (see FIG. 4) indicating angles, with a predetermined swing width W and a predetermined width. The angular positions γ and α at which the irradiation distance L becomes can be set. The attachment 4 is not limited to the above-described configuration, and various configurations that can adjust the angle of the apparatus main body 3 in the vertical and horizontal directions can be used.

  Referring again to FIG. 1, the apparatus main body 3 is attached to the installation height H of the column P standing outside the outer line 6 of the road 60 by the attachment 4, and the outer side of the road surface 61 from below to above. The line laser beam 51 is irradiated toward the line 6, and the line marking 5 is projected along the outer line 6 of the road 60. The line marking 5 is projected straight along the length direction of the outer line 6 on or near the outer line 6.

  At this time, as shown in the schematic diagram of FIG. 5 (B), the apparatus main body 3 of the road surface reflection type line-of-sight guidance apparatus 100 is installed, and the center position of the line marking 5 is arranged at the front position P2 in the road width direction of the apparatus main body installation position P1. When the linear laser beam 51 is irradiated as described above, the reflected light 53 of the linear laser beam 51 reflected on the road surface 61 has a large amount of reflected light upward, and the amount of reflected light in the lateral direction toward the vehicle driver is large. Less. The vehicle driver recognizes the front line marking 5 mainly by the reflected light from the road surface 61 of the line-shaped laser beam 51. For this reason, for example, a vehicle driver who is several tens of meters away from the position of the line marking 5 in this case (a vehicle driver facing the projection position of the line marking 5 forward) may not be able to clearly recognize the line marking 5. It was.

  Therefore, in this embodiment, as shown in the schematic diagram of FIG. 5A, the apparatus main body 3 of the road surface reflection type gaze guidance apparatus 1 is installed, and the optical axis 52 of the line-shaped laser light 51 is reversed in the vehicle traveling direction. Irradiating toward the direction side, the line marking 5 is projected onto a position P3 that is shifted in the direction opposite to the vehicle traveling direction from the road width direction front position P2 of the apparatus main body installation position P1 (see also FIG. 1). ). As a result, the reflected light 53 of the line-shaped laser light 51 reflected by the road surface 61 at the projection position of the line marking 5 is directed in the direction opposite to the traveling direction of the vehicle, and therefore the traveling direction of the vehicle with respect to the projection position of the line marking 5. The amount of reflected light of the line-shaped laser beam 51 heading in the reverse direction can be increased. As a result, even if the output of the laser light source 2 is not increased, a vehicle driver who faces the projection position of the line marking 5 forward can make the line marking 5 reflected by the reflected light of the line laser beam 51 bright and clear even from a distance. Can see.

  In this case, in order for the laser light source 2 to irradiate the optical axis 52 of the line-shaped laser light 51 toward the direction opposite to the traveling direction of the vehicle at the installation position of the support column P, the angle posture as shown in FIG. The apparatus main body 3 is installed by the angle adjusting mechanism of the fixture 4. That is, the installation height of the laser light source 2 from the road surface 61 is H, the swing width that is the shortest distance from the installation position of the laser light source 2 to the outer line 6 is W, and the road width of the installation position of the laser light source 2 on the outer line 6 When the irradiation distance from the position in front of the direction to the center position of the line marking 5 is L (see FIG. 1), the angle γ in the left-right direction of the apparatus main body 3 (see the top view shown in FIG. 6A) Is set by γ = Atan (L / W), and the angle α in the vertical direction of the apparatus main body 3 (see the side view from the width direction shown in FIG. 6B) is α = Atan Set by (L / H).

  However, the line of the line marking 5 is projected straight along the outer line 6 at a position P3 (see FIG. 1) which is shifted from the apparatus body installation position P1 directly in the road width direction front position P2 to the opposite side of the vehicle traveling direction. As described above, the operation of installing and adjusting the position of the apparatus main body 3 is very troublesome and takes time and labor. In other words, at a predetermined height position (installation height H) of the support column P, the apparatus main body 3 is predetermined left and right and up and down so that the irradiation direction of the laser light source 2 is directed to the irradiation position P3 that is shifted in the direction opposite to the vehicle traveling direction. The laser light source 2 needs to be rotated around the optical axis 52 so that the line of the line marking 5 is arranged straight along the outer line 6 in a state where the head is fixed to the angles α and γ. In this case, since the installation position P1 of the laser light source 2 and the irradiation position of the line-shaped laser light 51 (position P3 of the line marking 5) are far away from each other, even if the laser light source 2 is slightly rotated, the line-shaped laser light At the irradiation position P3 of 51, the direction of the line marking 5 greatly fluctuates.

  Therefore, in the present embodiment, in the case of the left-handed road 60, the laser light source 2 is a position where the line marking 5 is shifted from the front direction position P2 in the road width direction of the apparatus main body installation position P1 to the opposite side in the vehicle traveling direction. As seen from the base end 27 side of the laser light source 2, the line of the laser beam 51 is rotated clockwise from a vertical position where the line-shaped laser beam 51 extends vertically so that it is projected straight along the length direction of the outer line 6 at P3. A position rotated by an angle θ is set in advance (see FIG. 7). As described above, when the installation height from the road surface 61 to the laser light source 2 is H and the swing width, which is the shortest distance from the laser light source 2 to the outer line 6, is W, the rotation angle θ is θ = Atan ( W / H). Accordingly, when the laser light source 2 is installed at the installation height H and the swing width W, if the laser light source 2 is set to the rotation angle θ, the irradiation of the line-shaped laser light 51 is performed at the apparatus main body installation position P1. The line of the line marking 5 can be projected straight along the length direction of the outer line 6 even if it goes to an arbitrary position P3 that is shifted from the position P2 directly in front of the road width direction to the direction opposite to the traveling direction of the vehicle. Therefore, the installation work at the installation site of the road surface reflection type line-of-sight guidance apparatus 1 is very simple, easy, and can be performed quickly.

  In the present embodiment, as shown in FIG. 7, in the case 30, the laser light source 2 is installed in the column P so that the surface of the bottom plate 31 of the case 30 faces obliquely downward (see FIG. 7). 3)) with respect to one side of the bottom plate 31 disposed on the lower side or the upper side, as viewed from the base end 27 side of the laser light source 2, the line-shaped laser light 51 is clockwise from a position where the line extends vertically. The laser light source 2 is installed in advance with the rotation angle θ rotated. As a result, the apparatus main body 3 is moved left and right and up and down so that the irradiation direction of the laser light source 2 is shifted to the position (irradiation position) P3 that is shifted in the direction opposite to the vehicle traveling direction at the position of the support column P at the installation height H. By swinging and fixing to the predetermined angles α and γ, the line of the line marking 5 can be projected straight along the outer line 6 at the position P3 shifted to the opposite side in the traveling direction of the vehicle. Therefore, the installation work at the installation site of the road surface reflection-type line-of-sight guidance device 1 can be performed more easily, easily, and more quickly.

  The laser light source 2 is set to turn on or blink the line-shaped laser light 51 when the environment is dark, such as at night or during snowfall. When the line laser beam 51 is blinked, the line marking 5 blinks naturally, so that the recognition of the line marking 5 by the vehicle driver can be further enhanced, and the power consumption of the laser light source 2 is also turned on. Can be reduced.

  The installation height of the apparatus main body 3 is preferably set to a low position in consideration of the driver's eye level (about 1.2 m) of the passenger car, for example, 5 m or less, preferably 2.5-3. If installed at a height of 5 m, the vertical angle α of the laser light source 2 is increased without increasing the irradiation distance L, and the amount of reflected light of the line-shaped laser light 51 reaching the driver's eyes of the passenger car is further increased. Therefore, the vehicle driver can see the line mark 5 more brightly and clearly.

  Further, two or more apparatus main bodies 3 are installed, or two or more laser light sources 2 (see FIG. 8) or a plurality of laser light sources 2 are provided in the apparatus main body 3, and the line markings 5 by the respective laser light sources 2 are arranged in parallel or superimposed. You may arrange | position so that it may project. In this case, the amount of reflected light of the line-shaped laser light 51 in the direction opposite to the traveling direction of the vehicle is further increased, so that the vehicle driver facing the projection position of the line marking 5 forward is reflected by the reflected light of the line-shaped laser light 51. The line marking 5 can be seen more brightly and clearly.

DESCRIPTION OF SYMBOLS 1 Road surface reflection type line-of-sight guidance apparatus 2 Laser light source 3 Apparatus main body 4 Mounting tool 5 Line marking 6 Outer line 7 Apparatus mounting bracket 8 Strut mounting bracket 9 Connecting bracket 26 Laser light emission port 27 Base end 30 of laser light source Case 31 Bottom plate 32 Window Section 33 Head section 34 Swelling section 35 Projection piece 51 Line-shaped laser beam 52 Optical axis 60 Road 61 Road surface α Vertical angle β Line-shaped laser beam emission angle γ Horizontal angle θ Laser light source rotation angle P1 Device body Installation position P2 Road width direction front position P3 Position shifted to the opposite side in the vehicle traveling direction (line marking irradiation position)
P support (support)
W Swing width L Irradiation distance

Claims (6)

A laser light source that irradiates a line-shaped laser beam so that a line marking is projected on the road surface, and a laser light source that is stored at a predetermined height position of a support that stands outside the outer line of the road by a fixture A device body to be installed,
In the state where the apparatus main body is installed on the support by the fixture, the line marking is located on the outer line or in the vicinity of the outer line at a position deviated from the front position in the width direction of the apparatus main body installation position to the opposite side in the traveling direction of the vehicle. The optical axis of the line-shaped laser light is directed obliquely downward from the outside of the outside line and toward the opposite side of the traveling direction of the vehicle so that it is projected along the length direction of the outside line. A road surface reflection type line-of-sight guidance apparatus configured to cause a vehicle driver to recognize the line marking by reflected light of the line-shaped laser light from the road surface. In the road surface reflection type gaze guidance device according to claim 1,
In the case of a left-handed road,
The laser light source is set at a position rotated by a rotation angle θ in the clockwise direction from a vertical position where the line of the laser beam extends vertically when viewed from the base end side of the laser light source,
When the installation height of the laser light source from the road surface is H and the swing width that is the shortest distance from the laser light source to the outer line is W, the rotation angle θ is road surface reflection set by θ = Atan (W / H). Type gaze guidance device. In the road surface reflection type gaze guidance device according to claim 2,
The apparatus body includes a rectangular box-shaped case, and a rectangular bottom plate of the case is provided with a window for emitting line laser light of a laser light source,
In the case, the laser light source is placed in a state where the apparatus main body is installed on the support so that the end of the line laser beam on the emission side faces the window and the surface of the bottom plate of the case faces obliquely downward. With respect to one side of the bottom plate arranged on the side or the upper side, as viewed from the base end side of the laser light source, the line of the laser beam is rotated clockwise from the position extending in the vertical direction by the rotation angle θ. An installed road surface reflection type gaze guidance device. In the road surface reflection type gaze guidance device according to any one of claims 1 to 3,
The apparatus main body is provided with two or more laser light sources, and is arranged so as to project line markings from the laser light sources in parallel or in a superimposed manner. In the road surface reflection type gaze guidance device according to any one of claims 1 to 4,
The laser light source is a road surface reflection type line-of-sight guidance device that is set to blink a line-shaped laser beam.   Using a laser light source that irradiates a line laser beam so that the line mark is projected on the road surface, the line mark moves on the outer line or in the vicinity of the outer line from the front position in the width direction of the installation position of the laser light source. The optical axis of the line-shaped laser beam is directed obliquely downward from the outside of the outer line so as to be projected along the length direction of the outer line at a position shifted in the direction opposite to the direction, and the vehicle travels A road surface reflection type gaze guidance method that irradiates the direction opposite to the direction and causes the vehicle driver to recognize the line marking by the reflected light of the line laser beam from the road surface.

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