CN112884194A - Variable lane switching and signal timing method based on signalized intersection running condition - Google Patents

Variable lane switching and signal timing method based on signalized intersection running condition Download PDF

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CN112884194A
CN112884194A CN202011472992.XA CN202011472992A CN112884194A CN 112884194 A CN112884194 A CN 112884194A CN 202011472992 A CN202011472992 A CN 202011472992A CN 112884194 A CN112884194 A CN 112884194A
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陈昊
屈小琳
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Suzhou Industrial Park Surveying Mapping And Geoinformation Co ltd
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Abstract

The invention discloses a variable lane switching and signal timing method based on the running state of a signalized intersection, which comprises the following steps: s1, collecting data, arranging traffic flow detection equipment at the intersection, and collecting basic data of the signalized intersection; s2, setting a threshold value, and setting a variable lane switching threshold value according to basic data of the signalized intersection; s3, adjusting the signal timing of the signalized intersection according to the traffic running condition after the lane changing is performed during the timing adjustment; and S4, simulating and optimizing the scheme, performing simulation implementation on the scheme, performing tracking evaluation on the implementation effect, and optimizing the scheme according to the evaluation result, so that the intersection lane allocation and signal timing are more consistent with the actual traffic operation rule, the road passing efficiency is effectively improved, and the vehicle passing delay is reduced.

Description

Variable lane switching and signal timing method based on signalized intersection running condition
Technical Field
The invention relates to the technical field of traffic signal control, in particular to a variable lane switching and signal timing method based on the running condition of a signalized intersection.
Background
With the development of cities, the quantity of motor vehicles kept is continuously increased, the contradiction between supply and demand in urban traffic is more and more conflicted, and the urban congestion phenomenon is gradually intensified. However, compared with the growth rate of motor vehicles in cities, the construction rate of urban roads is much lower, and meanwhile, the construction cost of building and reconstructing the expanded roads is higher, the construction period of road facilities is long, the requirements are difficult to meet in a short time, and the expected implementation effect cannot be achieved. Therefore, under the existing road resource conditions, the utilization efficiency of roads is improved to the maximum extent, and a scientific traffic control scheme is formulated, so that the key problems to be solved by current main approaches for relieving traffic congestion and traffic researchers are provided.
The variable lane at the entrance lane of the signalized intersection is used as one of tidal traffic, and traffic at the intersection is effectively organized by changing the driving directions or driving types on certain lanes at different time intervals, so that the space-time resources of the existing road are fully utilized, and the problem of traffic jam caused by unbalanced turning at the intersection can be effectively solved to the greatest extent. Currently, variable lanes have been implemented in multiple cities.
The existing variable lane switching control method has the following defects: firstly, the variable lane is switched at regular time, and the variable lane cannot adapt to the daily flow change condition; the variable lane is not associated with signal timing; and thirdly, after the congestion happens, the variable lane switching can cause that the vehicles accumulated in the original variable lane can not pass.
Disclosure of Invention
In order to overcome the defects, the invention aims to provide a variable lane switching and signal timing method based on the operation condition of a signalized intersection, which can enable the lane allocation and signal timing of the intersection to be more consistent with the actual traffic operation rule, effectively improve the road traffic efficiency and reduce the vehicle traffic delay.
In order to achieve the above purposes, the invention adopts the technical scheme that: a variable lane switching and signal timing method based on the running condition of a signalized intersection comprises the following steps: s1, collecting data, arranging traffic flow detection equipment at the intersection, and collecting basic data of the signalized intersection; s2, setting a threshold value, and setting a variable lane switching threshold value according to basic data of the signalized intersection; s3, adjusting the signal timing of the signalized intersection according to the traffic running condition after the lane changing is performed during the timing adjustment; and S4, simulating and optimizing the scheme, simulating and implementing the scheme, tracking and evaluating the implementation effect, and optimizing the scheme according to the evaluation result.
Preferably, the signalized intersection basic data in the step S1 includes signalized intersection static basic information and signalized intersection dynamic basic information, the signalized intersection static basic information includes number of lanes in the direction of the entrance lane, channelized setting data, and detector arrangement data, and the signalized intersection dynamic basic information includes signalized intersection current signal phase sequence design and timing setting data, and signalized intersection traffic flow data.
Preferably, the step S1 of arranging the traffic flow detection device at the intersection includes arranging a coil device at the stop line or arranging a microwave and video detector at the opposite direction.
Preferably, the setting of the variable lane switching threshold in step S2 is conditioned on the number of lanes in the approach direction, and when the number of lanes in the approach direction is less than 4, the variable lane is not set.
Preferably, the step S2 sets the variable lane switching threshold on the condition of the flow rate and the actual traffic capacity of the intersection, and switches the variable lane when changing the attribute of the variable lane would increase the flow rate and the actual traffic capacity of the intersection; the variable lanes remain unchanged when changing the variable lane attributes would leave the flow and the actual capacity of the intersection unchanged or even decline.
Further, according to the flow and the actual traffic capacity of the intersection, 5 calculation formulas are established:
firstly, the initial traffic capacity of the left-turn phase at the signalized intersection is as follows:
Figure BDA0002836535920000021
wherein:
SL-saturated flow of left-turn phase before the variable lane property becomes straight;
gL-green time duration for a left turn phase at signalized intersection;
c-signal timing period;
secondly, the initial traffic capacity of the straight-going phase of the signalized intersection is as follows:
Figure BDA0002836535920000031
wherein:
SS-saturated flow of straight phase before the variable lane property becomes straight;
gS-green time duration of straight-ahead phase at signalized intersection;
and the traffic capacity of the lane at the signal intersection in the left-turn phase after the lane at the signal intersection is changed from left-turn to straight-going is as follows:
Figure BDA0002836535920000032
wherein:
b, the number of initial left-turn lanes at the intersection;
m-number of variable lanes;
the traffic capacity of the straight-going phase after the attribute of the lane at the signal intersection is changed from left turning to straight going is as follows:
Figure BDA0002836535920000033
wherein:
a-the number of initial left-turn lanes at the intersection;
and fifthly, the change value of the traffic capacity of the whole signalized intersection before and after the change of the variable lane attribute is as follows:
Figure BDA0002836535920000034
wherein:
qS-intersection set-up rate of arrival (veh/s) of the approach straight vehicles of the variable lane;
qL-intersection set the rate of arrival (veh/s) of the vehicles turning left on the approach of the variable lane;
y-total flow ratio of the initial protocol;
l-total loss time(s) of signal phase at signalized intersection;
when the variable lane change threshold is
Figure BDA0002836535920000035
Meanwhile, the flow and the actual traffic capacity of the intersection are increased, and the variable lane can be switched at the moment; when the variable lane change threshold is
Figure BDA0002836535920000036
Meanwhile, the flow and the actual traffic capacity of the intersection are unchanged and even decline, and the variable lane is kept unchanged at the moment.
Further, step S2.5 is added between step S2 and step S3: and connecting the traffic flow detection equipment and the variable lane indicator into a signal machine, inputting the values of a, b and m in the threshold model, and setting a trigger sentence in the signal machine to realize automatic switching of the variable lane.
Preferably, the traffic operation conditions in step S3 include intersection channelized data, traffic supply data, intersection flow ratio, traffic capacity, and intersection traffic flow change data between different directions.
Further, according to the signal timing and the traffic operation condition in the step S3, 5 calculation formulas are established:
firstly, the flow ratio of the intersection after the variable lane switching is as follows:
Figure BDA0002836535920000041
wherein:
y' -total flow ratio after the attribute of the variable lane at the intersection entrance lane is changed;
the total flow ratio before the attribute of the variable lane at the entrance of the Y-signal intersection is changed;
yS-a flow ratio of the straight phase before the property of the variable lane becomes straight;
yL-a flow ratio of the left turn phase before the variable lane property becomes straight;
secondly, according to the Webster model, the signal timing period is as follows:
Figure BDA0002836535920000042
and thirdly, after the attribute of the variable lane of the entrance lane of the signalized intersection is changed, the effective green time of the left turn phase of the entrance lane is as follows:
Figure BDA0002836535920000043
fourthly, after the attribute of the variable lane of the entrance lane of the signalized intersection is changed, the effective green time of the straight-going phase of the entrance lane is as follows:
Figure BDA0002836535920000044
fifthly, after the attribute of the variable lane at the entrance of the signalized intersection is changed, the effective green time of other phases is as follows:
Figure BDA0002836535920000045
wherein:
yi-the original flow ratio of the other phases before the change of the property of the variable lane of the signalized intersection approach.
Preferably, the implementation effect in the step S4 includes data comparison analysis.
The lane-variable switching and signal timing method based on the running state of the signalized intersection has the beneficial effects that:
setting a threshold value according to the actual traffic running condition, and automatically switching the variable lanes when the condition meets the threshold value so as to adapt to the daily flow change condition.
And secondly, the variable lane change condition is linked with signal timing, and the intersection phase timing is synchronously adjusted after the variable lane is switched.
And thirdly, setting a variable lane switching threshold from the angle of the change of the traffic capacity of the intersection, and performing advanced management and control on road congestion.
Drawings
Fig. 1 is a schematic diagram of lane arrangement and traffic flow detection equipment arrangement.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.
Referring to fig. 1, a variable lane switching and signal timing method based on the operation condition of a signalized intersection comprises the following steps:
s1, arranging traffic flow detection equipment at the intersection to collect basic data of the signalized intersection; in order to collect more accurate traffic flow data, coil equipment is required to be arranged at a stop line of an intersection, or equipment such as microwaves and video detectors are arranged oppositely and traffic operation basic parameters at a stop line of an entrance lane are detected, the collected basic data of the signalized intersection comprise static basic information of the signalized intersection and dynamic basic information of the signalized intersection, the dynamic basic information of the signalized intersection comprises current signal phase sequence design and timing setting data and traffic operation flow data of the signalized intersection, and the static basic information of the signalized intersection comprises the number of lanes in the direction of the entrance lane, channelized setting data and detector arrangement data;
s2, setting a variable lane switching threshold according to the basic data of the signalized intersection; in order to ensure that the function of the variable lane is effectively exerted, when the variable lane switching threshold value is set, the number of lanes in the direction of an entrance lane of the variable lane is more than or equal to 4, so that the special straight-going lane, left-turning lane, right-turning lane and variable lane are ensured at the entrance lane of the intersection, and if the variable lane is arranged at the intersection with less lanes at the entrance lane and larger traffic volume, delay of other phase vehicles is increased possibly to cause negative influence; the variable lane switching threshold value takes the flow and the actual traffic capacity of the intersection as conditions, when the flow and the actual traffic capacity of the intersection are increased by changing the attribute of the variable lane, the variable lane is switched, and when the flow and the actual traffic capacity of the intersection are unchanged or even reduced by changing the attribute of the variable lane, the variable lane is kept unchanged;
the initial capacity for a signalized intersection left turn phase is:
Figure BDA0002836535920000061
wherein:
SL-saturated flow of left-turn phase before the variable lane property becomes straight;
gL-green time duration for a left turn phase at signalized intersection;
c-signal timing period;
the initial traffic capacity for the straight-ahead phase at the signalized intersection is:
Figure BDA0002836535920000062
wherein:
SS-saturated flow of straight phase before the variable lane property becomes straight;
gS-green time duration of straight-ahead phase at signalized intersection;
the traffic capacity of the left-turn phase of the intersection after the attribute of the lane at the signal intersection is changed from left-turn to straight-going is as follows:
Figure BDA0002836535920000063
wherein:
b, the number of initial left-turn lanes at the intersection;
m-number of variable lanes;
when the property of the lane at the signal intersection is changed from left turning to straight going, the traffic capacity of the straight going phase is as follows:
Figure BDA0002836535920000064
wherein:
a-the number of initial left-turn lanes at the intersection;
the change value of the traffic capacity of the whole signalized intersection before and after the change of the variable lane attribute is as follows:
Figure BDA0002836535920000071
wherein:
qS-intersection set-up rate of arrival (veh/s) of the approach straight vehicles of the variable lane;
qL-intersection set the rate of arrival (veh/s) of the vehicles turning left on the approach of the variable lane;
y-total flow ratio of the initial protocol;
l-total loss time(s) of signal phase at signalized intersection;
therefore, when the variable lane change threshold is
Figure BDA0002836535920000072
Meanwhile, the flow and the actual traffic capacity of the intersection are increased, and the variable lane can be switched at the moment; when the variable lane change threshold is
Figure BDA0002836535920000073
Meanwhile, the flow and the actual traffic capacity of the intersection are unchanged, even decline, and the variable lane is kept unchanged at the moment;
in order to realize the automatic switching of the variable lane under the condition of meeting the threshold value, the traffic detection equipment established at the intersection and the variable lane indicator are connected into the annunciator, the lane process of the variable lane entrance lane is set according to the intersection, the values of a, b and m in the threshold value model are input, and the triggering statement is set in the annunciator to realize the automatic switching of the variable lane;
s3, adjusting the signal timing of the signalized intersection according to the traffic running condition after the variable lane switching; due to the switching of the variable lanes, intersection channelized data, traffic supply data, intersection flow ratio, traffic capacity and traffic flow change data among different directions of the intersection are changed, so that signal timing is adjusted according to the latest traffic running condition, and the traffic signal timing is matched with the latest traffic flow condition;
the flow ratio of the intersection after the lane switching is variable is as follows:
Figure BDA0002836535920000074
wherein:
y' -total flow ratio after the attribute of the variable lane at the intersection entrance lane is changed;
the total flow ratio before the attribute of the variable lane at the entrance of the Y-signal intersection is changed;
yS-a flow ratio of the straight phase before the property of the variable lane becomes straight;
yL-a flow ratio of the left turn phase before the variable lane property becomes straight;
according to the Webster model, the signal timing period is as follows:
Figure BDA0002836535920000081
when the attribute of the variable lane of the entrance lane of the signalized intersection is changed, the effective green time of the left turn phase of the entrance lane is as follows:
Figure BDA0002836535920000082
when the attribute of the variable lane of the entrance lane of the signalized intersection is changed, the effective green time of the straight-going phase of the entrance lane is as follows:
Figure BDA0002836535920000083
when the attribute of the variable lane of the entrance lane of the signalized intersection is changed, the effective green time of other phases is as follows:
Figure BDA0002836535920000084
wherein:
yi-the original flow ratio of the other phases before the change of the property of the variable lane of the signalized intersection entrance lane;
s4, simulating and implementing the scheme by using traffic simulation software, performing implementation effect tracking evaluation through data comparison analysis, and optimizing the scheme according to the evaluation result; the signal timing adjustment model is suitable for the condition that supersaturation occurs to a single-turn traffic flow after the switching of the variable lanes of the intersection, namely, the condition that the variable lanes overflow or the condition that the supersaturation occurs to the traffic flow in the direction of the reduced lane after the switching of the variable lanes, if the supersaturation occurs to the left-turn phase traffic flow and the straight-going phase traffic flow after the switching of the variable lanes, the change of the attribute of the variable lane at the entrance lane of the signal intersection is not obvious for improving the traffic jam condition at the entrance lane of the signal intersection, and the signal intersection needs to be redesigned and optimized in canalization and signal timing under the condition.
In order to simplify the calculation result, the scenes in the text are all that the variable lane is switched from the left-turn lane to the straight lane, and the same is true for the threshold model and the signal timing adjustment model of the variable lane which is switched from the straight lane to the left-turn or other change forms.
The above embodiments are merely illustrative of the technical concept and features of the present invention, and the present invention is not limited thereto, and any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.

Claims (10)

1. A variable lane switching and signal timing method based on the running state of a signalized intersection is characterized in that: the method comprises the following steps:
s1, collecting data, arranging traffic flow detection equipment at the intersection, and collecting basic data of the signalized intersection;
s2, setting a threshold value, and setting a variable lane switching threshold value according to basic data of the signalized intersection;
s3, adjusting the signal timing of the signalized intersection according to the traffic running condition after the lane changing is performed during the timing adjustment;
and S4, simulating and optimizing the scheme, simulating and implementing the scheme, tracking and evaluating the implementation effect, and optimizing the scheme according to the evaluation result.
2. The signalized intersection operation condition-based variable lane switching and signal timing method according to claim 1, characterized in that: the signal intersection basic data in the step S1 include signal intersection static basic information and signal intersection dynamic basic information, the signal intersection static basic information includes number of lanes in the direction of the lane, channelized setting data, and detector arrangement data, and the signal intersection dynamic basic information includes signal intersection current signal phase sequence design and timing setting data, and signal intersection traffic flow data.
3. The signalized intersection operation condition-based variable lane switching and signal timing method according to claim 1, characterized in that: the step S1 of arranging the traffic flow detection device at the intersection includes arranging a coil device at the stop line or arranging a microwave and video detector at the opposite direction.
4. The signalized intersection operation condition-based variable lane switching and signal timing method according to claim 1, characterized in that: the variable lane switching threshold set in step S2 is conditioned on the number of lanes in the entrance lane direction, and when the number of lanes in the entrance lane direction is less than 4, no variable lane is set.
5. The signalized intersection operation condition-based variable lane switching and signal timing method according to claim 1, characterized in that: setting a variable lane switching threshold in step S2 on the condition that the flow rate and the actual traffic capacity of the intersection are increased, and switching the variable lane when the flow rate and the actual traffic capacity of the intersection are increased by changing the attribute of the variable lane; the variable lanes remain unchanged when changing the variable lane attributes would leave the flow and the actual capacity of the intersection unchanged or even decline.
6. The signalized intersection operation condition-based variable lane switching and signal timing method according to claim 5, wherein: according to the flow and the actual traffic capacity of the intersection, 5 calculation formulas are established:
firstly, the initial traffic capacity of the left-turn phase at the signalized intersection is as follows:
Figure FDA0002836535910000021
wherein:
SL-saturated flow of left-turn phase before the variable lane property becomes straight;
gL-green time duration for a left turn phase at signalized intersection;
c-signal timing period;
secondly, the initial traffic capacity of the straight-going phase of the signalized intersection is as follows:
Figure FDA0002836535910000022
wherein:
SS-saturated flow of straight phase before the variable lane property becomes straight;
gS-green time duration of straight-ahead phase at signalized intersection;
and the traffic capacity of the lane at the signal intersection in the left-turn phase after the lane at the signal intersection is changed from left-turn to straight-going is as follows:
Figure FDA0002836535910000023
wherein:
b, the number of initial left-turn lanes at the intersection;
m-number of variable lanes;
the traffic capacity of the straight-going phase after the attribute of the lane at the signal intersection is changed from left turning to straight going is as follows:
Figure FDA0002836535910000024
wherein:
a-the number of initial left-turn lanes at the intersection;
and fifthly, the change value of the traffic capacity of the whole signalized intersection before and after the change of the variable lane attribute is as follows:
Figure FDA0002836535910000025
wherein:
qS-intersection set-up rate of arrival (veh/s) of the approach straight vehicles of the variable lane;
qL-intersection set the rate of arrival (veh/s) of the vehicles turning left on the approach of the variable lane;
y-total flow ratio of the initial protocol;
l-total loss time(s) of signal phase at signalized intersection;
when the variable lane change threshold is
Figure FDA0002836535910000031
Meanwhile, the flow and the actual traffic capacity of the intersection are increased, and the variable lane can be switched at the moment; when the variable lane change threshold is
Figure FDA0002836535910000032
Meanwhile, the flow and the actual traffic capacity of the intersection are unchanged and even decline, and the variable lane is kept unchanged at the moment.
7. The signalized intersection operation condition-based variable lane switching and signal timing method according to claim 1, characterized in that: step S2.5 is added between step S2 and step S3: and connecting the traffic flow detection equipment and the variable lane indicator into a signal machine, inputting the values of a, b and m in the threshold model, and setting a trigger sentence in the signal machine to realize automatic switching of the variable lane.
8. The signalized intersection operation condition-based variable lane switching and signal timing method according to claim 1, characterized in that: the traffic operation conditions in the step S3 include intersection channelized data, traffic supply data, intersection flow rate ratio, traffic capacity, and data of traffic flow change between different directions of the intersection.
9. The signalized intersection operation condition-based variable lane switching and signal timing method according to claim 8, wherein: according to the signal timing and the traffic operation conditions in the step S3, 5 calculation formulas are established:
firstly, the flow ratio of the intersection after the variable lane switching is as follows:
Figure FDA0002836535910000033
wherein:
y' -total flow ratio after the attribute of the variable lane at the intersection entrance lane is changed;
the total flow ratio before the attribute of the variable lane at the entrance of the Y-signal intersection is changed;
yS-a flow ratio of the straight phase before the property of the variable lane becomes straight;
yL-a flow ratio of the left turn phase before the variable lane property becomes straight;
secondly, according to the Webster model, the signal timing period is as follows:
Figure FDA0002836535910000034
and thirdly, after the attribute of the variable lane of the entrance lane of the signalized intersection is changed, the effective green time of the left turn phase of the entrance lane is as follows:
Figure FDA0002836535910000035
fourthly, after the attribute of the variable lane of the entrance lane of the signalized intersection is changed, the effective green time of the straight-going phase of the entrance lane is as follows:
Figure FDA0002836535910000041
fifthly, after the attribute of the variable lane at the entrance of the signalized intersection is changed, the effective green time of other phases is as follows:
Figure FDA0002836535910000042
wherein:
yi-the original flow ratio of the other phases before the change of the property of the variable lane of the signalized intersection approach.
10. The signalized intersection operation condition-based variable lane switching and signal timing method according to claim 1, characterized in that: the implementation effect in the step S4 includes data comparison analysis.
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CN113763728A (en) * 2021-09-17 2021-12-07 青岛海信网络科技股份有限公司 Traffic organization and signal timing collaborative optimization method, device and equipment
CN114241768A (en) * 2021-12-18 2022-03-25 擎翌(上海)智能科技有限公司 Variable lane switching method and variable lane switching system

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