CN105513366A - Method for judging traffic state of road intersection - Google Patents

Method for judging traffic state of road intersection Download PDF

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Publication number
CN105513366A
CN105513366A CN201610094901.0A CN201610094901A CN105513366A CN 105513366 A CN105513366 A CN 105513366A CN 201610094901 A CN201610094901 A CN 201610094901A CN 105513366 A CN105513366 A CN 105513366A
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China
Prior art keywords
intersection
entrance driveway
traffic behavior
point
single entrance
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CN201610094901.0A
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CN105513366B (en
Inventor
熊启鹏
曾小清
袁腾飞
朱静
杨林翔
邹临风
陈宇佳
王刚
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Suzhou Liutouniu Information Technology Co ltd
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Shanghai Guolu Traffic Technology Co Ltd
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
    • G08G1/0125—Traffic data processing
    • G08G1/0133—Traffic data processing for classifying traffic situation

Abstract

The method discloses a method for judging the traffic state of a road intersection. The method includes the steps that the position of a saturation point of each single entrance lathe is determined according to a formula (1), and the position of an overflow point of each single entrance lathe is determined according to a formula (2), wherein the saturation point indicates the length of the number of vehicles which can be dissipated by the single entrance lathe within valid green time in one cycle of the road intersection, and the overflow point indicates the length of the number of vehicles which are permitted through by an upstream intersection within the longest green time and can be received by the single entrance lathe, and guarantees that the vehicles will not overflow and influence the upstream intersection when queuing at the single entrance lathe; the traffic states of the single entrance lathes are judged according to the positions of the saturation points and the positions of the overflow points, and the traffic state of the road intersection is judged according to the traffic states of the entrance lathes of the road intersection. According to the method, the accuracy of judging the traffic state of the road intersection is improved by comprehensively analyzing the influences of time and space on traffic of the road intersection.

Description

A kind of intersection traffic behavior decision method
Technical field
The present invention relates to a kind of intersection traffic behavior decision method, be applied to the judgement to intersection traffic behavior, belong to field of road traffic.
Background technology
The each city traffic of current China blocks up day by day serious, greatly hinders socioeconomic development.In the peak period of traffic trip, intersection often becomes state of saturation from unsaturated state.Now in order to improve traffic control benefit, shorten crossing queue length, crossing needs to carry out Saturation Control.And to judge whether crossing enters state of saturation be exactly the prerequisite of carrying out the control of saturation traffic signal.
The traffic control system applied all over the world now mainly relies on inductive coil detecting device to gather the parameters such as the magnitude of traffic flow, speed, time occupancy, and then differentiates crossing state, optimization signal time distributing conception.But after the queuing vehicle of crossing crosses inductive coil detecting device, traffic control system just can not collect the real traffic flow parameter in crossing, now cannot differentiate the degree of saturation of crossing exactly.In addition, according to queue length, existing method of discrimination mainly differentiates whether crossing is in hypersaturated state, and queue length dynamic change under the impact of signal lamp, be difficult to accurate measurement, cause discrimination precision not high.Said method is used for judging the real-time traffic states of intersection, but have ignored globality and the spatial distribution characteristic of intersection traffic behavior.Namely the traffic of intersection is in flow state, needs to consider that the green time utilization factor of this intersection and this intersection are to the influence of upstream intersection simultaneously.And obviously lack this technology in prior art.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of to consider influence between the green time utilization factor of intersection and intersection to judge the method for intersection traffic behavior, makes the judgement of intersection traffic behavior more accurate.
To achieve these goals, the present invention adopts following technical scheme to be achieved:
A kind of intersection traffic behavior decision method, comprising:
Step 1: the position determining single entrance driveway saturation point according to formula (1), the position of single entrance driveway spill point is determined according to formula (2), described saturation point is the length that vehicle that in the one-period of intersection, single entrance driveway can dissipate in effective green time occupies, and described spill point is that single entrance driveway can not crossing, effect of flood upstream when can accept length that in the maximum green time in crossing, upstream, clearance vehicle number occupies and ensure that this single entrance driveway is queued up;
Formula (1):
L 1 = S 1 × f 1 × g e × L C 3600 × m 1
Wherein, L 1for saturation point is to the position of stop line, S 1for the saturation volume in section, f 1for crossing through vehicles is by the reduction coefficient turning to vehicle to affect, L cfor length of wagon, m 1for the number of track-lines of entrance driveway, g efor intersection effective green time;
Formula (2):
L 2 = L - S 2 × f 2 × g m a x × L C 3600 × m 2
Wherein, L is section total length, L 2for spill point is to the position of stop line, S 2for the saturation volume in section, f 2for crossing, upstream through vehicles is by the reduction coefficient turning to vehicle to affect, L cfor length of wagon, m 2for the number of track-lines in intersection exit road, upstream, g maxfor the maximum green time in crossing, upstream;
Step 2: according to the position of saturation point described in step 1 and described spill point, the traffic behavior of single entrance driveway is judged, according to the traffic behavior of each entrance driveway of intersection, the traffic behavior of this intersection is judged.
In step 2, by the following method the traffic behavior of single entrance driveway is judged:
When vehicle queue length is between described saturation point and stop line, i.e. L q<L 1, the traffic behavior of described single entrance driveway is undersaturated condition;
When vehicle queue length is between described saturation point and described spill point, i.e. L 1<L q<L 2, the traffic behavior of described single entrance driveway is saturated not overflow status;
When vehicle queue length exceedes position, spill point, i.e. L q>L 2, the traffic behavior of described single entrance driveway is saturated overflow status;
Wherein, L qfor vehicle queue length.
In step 2, by the following method the traffic behavior of described intersection is judged:
When the entrance driveway of described intersection is all in undersaturated condition, the traffic behavior of described intersection is undersaturated condition;
When saturated not overflow status appears in the entrance driveway of described intersection, the traffic behavior of described intersection is saturated not overflow status;
When saturated overflow status appears in the entrance driveway of described intersection, the traffic behavior of described intersection is saturated overflow status.
In step 2, judged the relation of described vehicle queue length and described saturation point and described spill point by the detecting device being arranged on described saturation point position and position, described spill point.
Comprise further: according to the result of determination of the traffic behavior of intersection described in step 2, the traffic control system of this intersection is arranged.
Compared with prior art, technical scheme provided by the invention is by determining the saturation point position of single entrance driveway, and as element of time, characterize the green time utilization factor of intersection, saturation point represents that the time availability of this intersection reaches capacity.By determining the position, spill point of single entrance driveway, as Space Elements, characterize the influence of this intersection to upstream intersection, spill point represents that the space availability ratio of this intersection reaches capacity, by composite analysis times and space on the impact of intersection traffic, improve the accuracy that intersection traffic behavior judges.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of single entrance driveway saturation point of the present invention and spill point;
Fig. 2 is the schematic diagram of single entrance driveway undersaturated condition of the present invention;
Fig. 3 is the schematic diagram of the saturated not overflow status of single entrance driveway of the present invention;
Fig. 4 is the schematic diagram of the saturated overflow status of single entrance driveway of the present invention.
Shown in figure: 1, saturation point; 2, spill point.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail:
With reference to shown in Fig. 1, intersection traffic behavior decision method of the present invention, comprising:
Step 1: the position determining single entrance driveway saturation point 1 according to formula (1), the position of single entrance driveway spill point 2 is determined according to formula (2), described saturation point 1 is the length that vehicle that in the one-period of intersection, single entrance driveway can dissipate in effective green time occupies, and described spill point 2 is that single entrance driveway can not crossing, effect of flood upstream when can accept length that in the maximum green time in crossing, upstream, clearance vehicle number occupies and ensure that this single entrance driveway is queued up;
Formula (1):
L 1 = S 1 &times; f 1 &times; g e &times; L C 3600 &times; m 1
Wherein, L 1for saturation point 1 is to the position of stop line, S 1for the saturation volume in section, f 1for crossing through vehicles is by the reduction coefficient turning to vehicle to affect, L cfor length of wagon, m 1for the number of track-lines of entrance driveway, g efor intersection effective green time;
Formula (2):
L 2 = L - S 2 &times; f 2 &times; g m a x &times; L C 3600 &times; m 2
Wherein, L is section total length, L 2for spill point 2 is to the position of stop line, S 2for the saturation volume in section, f 2for crossing, upstream through vehicles is by the reduction coefficient turning to vehicle to affect, L cfor length of wagon, m 2for the number of track-lines in intersection exit road, upstream, g maxfor the maximum green time in crossing, upstream.
Step 2: according to the position of saturation point 1 described in step 1 and described spill point 2, the traffic behavior of single entrance driveway is judged, according to the traffic behavior of each entrance driveway of intersection, the traffic behavior of this intersection is judged.
Concrete, by the following method the traffic behavior of single entrance driveway is judged:
As shown in Figure 2, when vehicle queue length is between described saturation point 1 and stop line, i.e. L q<L 1, the traffic behavior of described single entrance driveway is undersaturated condition;
As shown in Figure 3, when vehicle queue length is between described saturation point 1 and described spill point 2, i.e. L 1<L q<L 2, the traffic behavior of described single entrance driveway is saturated not overflow status;
As shown in Figure 4, when vehicle queue length exceedes position, spill point 2, i.e. L q>L 2, the traffic behavior of described single entrance driveway is saturated overflow status;
Wherein, L qfor vehicle queue length.
Preferably, the detecting device by being arranged on described saturation point 1 position and position, described spill point 2 judges the relation of described vehicle queue length and described saturation point 1 and described spill point 2.
Concrete, by the following method the traffic behavior of described intersection is judged:
When the entrance driveway of described intersection is all in undersaturated condition, the traffic behavior of described intersection is undersaturated condition;
When saturated not overflow status appears in the entrance driveway of described intersection, the traffic behavior of described intersection is saturated not overflow status;
When saturated overflow status appears in the entrance driveway of described intersection, the traffic behavior of described intersection is saturated overflow status.
Intersection traffic behavior decision method of the present invention comprises further: according to the result of determination of the traffic behavior of intersection described in step 2, arrange the traffic control system of this intersection.
Technical scheme provided by the invention is by determining saturation point 1 position of single entrance driveway, and as element of time, characterize the green time utilization factor of intersection, saturation point 1 represents that the time availability of this intersection reaches capacity.By determining the position, spill point 2 of single entrance driveway, as Space Elements, characterize the influence of this intersection to upstream intersection, spill point 2 represents that the space availability ratio of this intersection reaches capacity, by composite analysis times and space on the impact of intersection traffic, improve the accuracy that intersection traffic behavior judges.

Claims (5)

1. an intersection traffic behavior decision method, is characterized in that, comprising:
Step 1: the position determining single entrance driveway saturation point according to formula (1), the position of single entrance driveway spill point is determined according to formula (2), described saturation point is the length that vehicle that in the one-period of intersection, single entrance driveway can dissipate in effective green time occupies, and described spill point is that single entrance driveway can not crossing, effect of flood upstream when can accept length that in the maximum green time in crossing, upstream, clearance vehicle number occupies and ensure that this single entrance driveway is queued up;
Formula (1):
L 1 = S 1 &times; f 1 &times; g e &times; L C 3600 &times; m 1
Wherein, L 1for saturation point is to the position of stop line, S 1for the saturation volume in section, f 1for crossing through vehicles is by the reduction coefficient turning to vehicle to affect, L cfor length of wagon, m 1for the number of track-lines of entrance driveway, g efor intersection effective green time;
Formula (2):
L 2 = L - S 2 &times; f 2 &times; g m a x &times; L C 3600 &times; m 2
Wherein, L is section total length, L 2for spill point is to the position of stop line, S 2for the saturation volume in section, f 2for crossing, upstream through vehicles is by the reduction coefficient turning to vehicle to affect, L cfor length of wagon, m 2for the number of track-lines in intersection exit road, upstream, g maxfor the maximum green time in crossing, upstream;
Step 2: according to the position of saturation point described in step 1 and described spill point, the traffic behavior of single entrance driveway is judged, according to the traffic behavior of each entrance driveway of intersection, the traffic behavior of this intersection is judged.
2. decision method according to claim 1, is characterized in that, in step 2, judges by the following method to the traffic behavior of single entrance driveway:
When vehicle queue length is between described saturation point and stop line, i.e. L q<L 1, the traffic behavior of described single entrance driveway is undersaturated condition;
When vehicle queue length is between described saturation point and described spill point, i.e. L 1<L q<L 2, the traffic behavior of described single entrance driveway is saturated not overflow status;
When vehicle queue length exceedes position, spill point, i.e. L q>L 2, the traffic behavior of described single entrance driveway is saturated overflow status;
Wherein, L qfor vehicle queue length.
3. decision method according to claim 1, is characterized in that, in step 2, judges by the following method to the traffic behavior of described intersection:
When the entrance driveway of described intersection is all in undersaturated condition, the traffic behavior of described intersection is undersaturated condition;
When saturated not overflow status appears in the entrance driveway of described intersection, the traffic behavior of described intersection is saturated not overflow status;
When saturated overflow status appears in the entrance driveway of described intersection, the traffic behavior of described intersection is saturated overflow status.
4. decision method according to claim 1, is characterized in that, in step 2, is judged the relation of described vehicle queue length and described saturation point and described spill point by the detecting device being arranged on described saturation point position and position, described spill point.
5. decision method according to claim 1, is characterized in that, comprises further: according to the result of determination of the traffic behavior of intersection described in step 2, arranges the traffic control system of this intersection.
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CN106803347A (en) * 2017-03-28 2017-06-06 东南大学 Urban intersection traffic state judging method based on RFID data
CN106856049A (en) * 2017-01-20 2017-06-16 东南大学 Crucial intersection demand clustering analysis method based on bayonet socket number plate identification data
CN110100271A (en) * 2016-11-29 2019-08-06 赫尔环球有限公司 For using the method, apparatus and computer program product of data traffic signal estimating road traffic situation
CN111932916A (en) * 2020-07-31 2020-11-13 长沙理工大学 Control method and control system for dynamic emergency lane of urban road

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CN111932916A (en) * 2020-07-31 2020-11-13 长沙理工大学 Control method and control system for dynamic emergency lane of urban road

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