CN104809870A - Viaduct entrance ramp traffic congestion grade estimation method - Google Patents

Abstract

The present invention relates to a kind of overpass Entrance ramp traffic jam level estimation methods, comprising: obtains the device data of lift height-limiting frame, which includes Entrance ramp data on flows; According to Entrance ramp data on flows, multilane one direction total flow in a collection period is calculated, takes within one month multilane one direction total flow corresponding to all collection period as sample set; Sample set is pre-processed, the exceptional value in Rejection of samples set; Calculate the critical value of sample set , according to critical value Calculate the traffic behavior coefficient k of Entrance ramp; Traffic congestion index TCI is calculated according to the traffic behavior coefficient k of Entrance ramp; The traffic jam level of overpass Entrance ramp is estimated according to traffic congestion index TCI. The present invention realizes the jam level of quantization overpass Entrance ramp using this equipment of lift height-limiting frame, provides the quantitative information of jam level for overpass manager and driver, to realize that the unimpeded trip of overpass proposes new solution.

Description

A kind of overpass Entrance ramp traffic jam level method of estimation

Technical field

The present invention relates to urban viaduct Information Collecting & Processing technical field, especially a kind of overpass Entrance ramp traffic jam level method of estimation.

Background technology

Along with city size expand quick propelling, overpass system plays the part of an important role in whole Traffic Systems, in China, increasing city in the overpass system of Erecting and improving, as Beijing, Shanghai, Shenzhen, Hefei etc.But overpass system cost cost is high, for ensureing its service efficiency and security, in general, special type motor vehicle, medium-heavy truck, carrying hazardous product vehicle No entry overpass, especially overload and oversize vehicle; Meanwhile, the oversize vehicle speed of a motor vehicle is comparatively slow, it is comparatively large to take up room, and can have influence on the traffic efficiency of road in rush hour.

Overpass traffic has the advantages that flow is large, close, if driver's misjudgment, sails the ring road that blocks up into, just can only select to wait for, can cause a large amount of travel time losses like this.At present temporarily without the method quantized overpass Entrance ramp traffic jam level; often can there is the jam situation misjudgment of driver to overpass Entrance ramp and sail the ring road that blocks up into; and then make the traffic of overpass part travel direction when evening peak morning be in the state being close to paralysis, therefore the Entrance ramp of an overpass intuitively traffic jam level quantized is the information that overpass supvr and driver need in a hurry.

Lift height-limiting frame is a kind of facility of the intelligent limit for height management of incipient novel overpass, also be the facility that in current viaduct system, function is the most complete, it integrates equipment such as controlling assembly, induction, video, electronic police, achieve wagon detector, the control of ring road signal, interaction between variable induced screen, video monitoring equipment, be mainly overhead up ring road and grade separation according to actual management demand, limit for height is provided to control, to ensure the normal use of overpass.Meanwhile, lift height-limiting frame can obtain the telecommunication flow information of the Entrance ramp of each overpass, by can excavate the Entrance ramp jam level situation of whole viaduct system to these information analysis process, and then provide basis for block up management, traffic organization of the intellectuality realizing overpass.At present, there is no utilize lift height-limiting frame data to assess the traffic jam level of overpass Entrance ramp method occur.

Summary of the invention

The object of the present invention is to provide a kind of jam level utilizing lift height-limiting frame to realize quantification overpass Entrance ramp, be convenient to the overpass Entrance ramp traffic jam level method of estimation of the management of overpass and the routing of driver.

For achieving the above object, present invention employs following technical scheme: a kind of overpass Entrance ramp traffic jam level method of estimation, the method comprises the step of following order:

(1) obtain the device data of lift height-limiting frame, these data comprise Entrance ramp data on flows;

(2) according to Entrance ramp data on flows, calculate multilane one direction total flow in a collection period, get multilane one direction total flow within one month corresponding to all collection period as sample set, be designated as

X＝{x ₁,x ₂......x _n}；

(3) pre-service is carried out to sample set, the exceptional value in Rejection of samples set;

(4) sample set X={x is calculated ₁, x ₂... x _ncritical value x _c, according to critical value x _ccalculate the traffic behavior coefficient k of Entrance ramp;

(5) traffic congestion index TCI is calculated according to the traffic behavior coefficient k of Entrance ramp;

(6) traffic jam level of overpass Entrance ramp is estimated according to traffic congestion index TCI.

The device data of described lift height-limiting frame comprises device numbering, present position numbering, ring road title and Entrance ramp data on flows.

The scope of a described collection period is 10 minutes ~ 15 minutes, and multilane one direction total flow is obtained the summation of the one direction flow in each track.

Describedly pre-service is carried out to sample set refer to, threshold interval (0, M is set _sV], the data x in judgement sample set _nthreshold interval (0, the M whether set _sV] in, if x _n∈ (0, M _sV], then retain this sample data, if then reject this sample data; Described M _sVbe the one-lane theoretical maximum service volume of this Entrance ramp, its computing formula is as follows:

M _sVthe track number that=2100 × Entrance ramp comprises

Wherein, 2100 is the one-lane maximum service volumes of Entrance ramp, and its unit is pcu/ (h*ln).

Critical value x is obtained by following formula _c:

$x_c=\stackrel{\‾}{x}+\mathrm{\α}*\mathrm{\σ}$

Wherein: sample set X={x ₁, x ₂... x _naverage, its computing formula is as follows:

$\stackrel{\‾}{x}=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{x}_i/n$

σ is sample set X={x ₁, x ₂... x _nvariance, its computing formula is as follows:

$\mathrm{\σ}=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{(x_i-\stackrel{\‾}{x})}^2/n$

The value of α is relevant with degree of confidence, when degree of confidence gets 95%, and α=1.96; When degree of confidence gets 99%,

α=2.57; Getting degree of confidence at this is 95%, α=1.96;

The Entrance ramp data on flows of Real-time Collection lift height-limiting frame, calculates multilane one direction total flow x in the Real-time Collection cycle of Entrance ramp, the traffic behavior coefficient k by following formulae discovery Entrance ramp:

k＝x/x _c。

With traffic behavior coefficient k for radix, adopt the form calculus traffic congestion index TCI of piecewise function, computing formula is as follows:

$\mathrm{TCI}=\left\{\begin{array}{cc}5k& k<1\\ 5& k=1\\ 5+(k-1)*5& 1<k<2\\ 10& k\&GreaterEqual;2\end{array}\right..$

According to traffic congestion index TCI and table 1, table 1 is as follows:

Table 1

Table 1 is traffic congestion index TCI and traffic jam level mapping table.

As shown from the above technical solution, advantage of the present invention is as follows: first, lift height-limiting frame technology is compared traditional checkout equipment, have that function is many, dependable performance, integrated height, integration feature, while Information Monitoring, distributed intelligence that can be synchronous, also synchronously traffic control can be realized, namely higher once overpass jam level, lift height-limiting frame automatically can decline and carry out the damming of Entrance ramp, current limliting, shunting, carries out control; The second, after estimation traffic jam level, these jam level information can be passed to traffic administration person, judge whether that needs carry out intervention traffic to an one numerical value quantized; Simultaneously by jam level Information issued to driver, the jam situation that driver is different according to Entrance ramp, selects the shortest path consuming time, proposes new solution for realizing the unimpeded trip of overpass.

Accompanying drawing explanation

Fig. 1 is method flow diagram of the present invention;

Fig. 2 is the relation schematic diagram of traffic congestion index TCI and traffic behavior coefficient k.

Embodiment

As shown in Figure 1, a kind of overpass Entrance ramp traffic jam level method of estimation, comprising: (1) obtains the device data of lift height-limiting frame, and these data comprise Entrance ramp data on flows; (2) according to Entrance ramp data on flows, calculate multilane one direction total flow in a collection period, get multilane one direction total flow within one month corresponding to all collection period as sample set, be designated as X={x ₁, x ₂... x _n; (3) pre-service is carried out to sample set, the exceptional value in Rejection of samples set; (4) sample set X={x is calculated ₁, x ₂... x _ncritical value x _c, according to critical value x _ccalculate the traffic behavior coefficient k of Entrance ramp; (5) traffic congestion index TCI is calculated according to the traffic behavior coefficient k of Entrance ramp; (6) traffic jam level of overpass Entrance ramp is estimated according to traffic congestion index TCI.The device data of described lift height-limiting frame comprises device numbering, present position numbering, ring road title and Entrance ramp data on flows.The scope of a described collection period is 10 minutes ~ 15 minutes, and multilane one direction total flow is obtained the summation of the one direction flow in each track.

As shown in Figure 1, describedly pre-service is carried out to sample set refer to, threshold interval (0, M is set _sV], the data x in judgement sample set _nthreshold interval (0, the M whether set _sV] in, if x _n∈ (0, M _sV], then retain this sample data, if then reject this sample data; Described M _sVbe the one-lane theoretical maximum service volume of this Entrance ramp, its computing formula is as follows:

M _sVthe track number that=2100 × Entrance ramp comprises

Wherein, 2100 is the one-lane maximum service volumes of Entrance ramp, and its unit is pcu/ (h*ln).Rejecting abnormalities value is that the collector carried due to lift height-limiting frame equipment may occur abnormal data in links such as information acquisition, parsing, Internet Transmissions and need to reject, precision to ensure that the method.

Critical value x is obtained by following formula _c:

$x_c=\stackrel{\&OverBar;}{x}+\mathrm{\&alpha;}*\mathrm{\&sigma;}$

Wherein: sample set X={x ₁, x ₂... x _naverage, its computing formula is as follows:

$\stackrel{\&OverBar;}{x}=\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{x}_i/n$

σ is sample set X={x ₁, x ₂... x _nvariance, its computing formula is as follows:

$\mathrm{\&sigma;}=\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{(x_i-\stackrel{\&OverBar;}{x})}^2/n$

The value of α is relevant with degree of confidence, when degree of confidence gets 95%, and α=1.96; When degree of confidence gets 99%,

α=2.57; Getting degree of confidence at this is 95%, α=1.96; Visible, the present invention obtains critical value with history value and sample data, when the traffic environment of road changes, during the newly-built community of such as periphery, needs Resurvey sample data, to obtain critical value more accurately.

The Entrance ramp data on flows of Real-time Collection lift height-limiting frame, calculates multilane one direction total flow x in the Real-time Collection cycle of Entrance ramp, the traffic behavior coefficient k by following formulae discovery Entrance ramp:

k＝x/x _c。

As shown in Figure 2, with traffic behavior coefficient k for radix, adopt the form calculus traffic congestion index TCI of piecewise function, computing formula is as follows:

$\mathrm{TCI}=\left\{\begin{array}{cc}5k& k<1\\ 5& k=1\\ 5+(k-1)*5& 1<k<2\\ 10& k\&GreaterEqual;2\end{array}\right..$

According to traffic congestion index TCI and table 1, table 1 is as follows:

Table 1

Table 1 is traffic congestion index TCI and traffic jam level mapping table.

After estimation traffic jam level, one is these jam level information can be passed to traffic administration person, judges whether that needs carry out intervention traffic to an one numerical value quantized; Two is by jam level Information issued to driver, and the jam situation that driver is different according to Entrance ramp selects the shortest path consuming time.Such as, driver under normal circumstances, overpass is entered apart from the shortest by Entrance ramp 1, but the congestion index TCI of Entrance ramp is 10, is in congestion level, in the case, driver may select congestion index TCI less, the Entrance ramp 2 that jam level is lower or Entrance ramp 3 enter overpass, have so both saved hourage, and turn avoid aggravation of blocking up.

The present invention utilizes this equipment of lift height-limiting frame to realize quantizing the jam level of overpass Entrance ramp, take full advantage of the characteristic of lift height-limiting frame equipment, simultaneously also for overpass supvr and driver provide the quantitative information of jam level, being convenient to the reason selecting paths of management that supvr shoots the arrow at the target and driver, proposing new solution for realizing the unimpeded trip of overpass.

Claims (7)

1. an overpass Entrance ramp traffic jam level method of estimation, the method comprises the step of following order:

(1) obtain the device data of lift height-limiting frame, these data comprise Entrance ramp data on flows;

(2) according to Entrance ramp data on flows, calculate multilane one direction total flow in a collection period, get multilane one direction total flow within one month corresponding to all collection period as sample set, be designated as X={x ₁, x ₂... x _n;

(3) pre-service is carried out to sample set, the exceptional value in Rejection of samples set;

(4) sample set X={x is calculated ₁, x ₂... x _ncritical value x _c, according to critical value x _ccalculate the traffic behavior coefficient k of Entrance ramp;

(5) traffic congestion index TCI is calculated according to the traffic behavior coefficient k of Entrance ramp;

(6) traffic jam level of overpass Entrance ramp is estimated according to traffic congestion index TCI.

2. overpass Entrance ramp traffic jam level method of estimation according to claim 1, is characterized in that: the device data of described lift height-limiting frame comprises device numbering, present position numbering, ring road title and Entrance ramp data on flows.

3. overpass Entrance ramp traffic jam level method of estimation according to claim 1, is characterized in that: the scope of a described collection period is 10 minutes ~ 15 minutes, and multilane one direction total flow is obtained the summation of the one direction flow in each track.

4. overpass Entrance ramp traffic jam level method of estimation according to claim 1, is characterized in that: describedly carry out pre-service to sample set and refer to, arranges threshold interval (0, M _sV], the data x in judgement sample set _nthreshold interval (0, the M whether set _sV] in, if x _n∈ (0, M _sV], then retain this sample data, if then reject this sample data; Described M _sVbe the one-lane theoretical maximum service volume of this Entrance ramp, its computing formula is as follows:

M _sVthe track number that=2100 × Entrance ramp comprises

Wherein, 2100 is the one-lane maximum service volumes of Entrance ramp, and its unit is pcu/ (h*ln).

5. overpass Entrance ramp traffic jam level method of estimation according to claim 1, is characterized in that: obtain critical value x by following formula _c:

$x_c=\stackrel{\&OverBar;}{x}+\mathrm{\&alpha;}*\mathrm{\&sigma;}$

Wherein: sample set X={x ₁, x ₂... x _naverage, its computing formula is as follows:

$\stackrel{\&OverBar;}{x}=\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{x}_i/n$

σ is sample set X={x ₁, x ₂... x _nvariance, its computing formula is as follows:

$\mathrm{\&sigma;}=\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{(x_i-\stackrel{\&OverBar;}{x})}^2/n$

The value of α is relevant with degree of confidence, when degree of confidence gets 95%, and α=1.96; When degree of confidence gets 99%,

α=2.57; Getting degree of confidence at this is 95%, α=1.96;

The Entrance ramp data on flows of Real-time Collection lift height-limiting frame, calculates multilane one direction total flow x in the Real-time Collection cycle of Entrance ramp, the traffic behavior coefficient k by following formulae discovery Entrance ramp:

k＝x/x _c。

6. overpass Entrance ramp traffic jam level method of estimation according to claim 1, is characterized in that: with traffic behavior coefficient k for radix, and adopt the form calculus traffic congestion index TCI of piecewise function, computing formula is as follows:

$\mathrm{TCI}=\left\{\begin{array}{cc}5k& k<1\\ 5& k=1\\ 5+(k-1)*5& 1<k<2\\ 10& k\&GreaterEqual;2\end{array}\right..$

7. overpass Entrance ramp traffic jam level method of estimation according to claim 1, is characterized in that: according to traffic congestion index TCI and table 1, table 1 is as follows:

Table 1

Table 1 is traffic congestion index TCI and traffic jam level mapping table.