CN102592448A - Method for testing safety performance of unsignalized intersection by utilizing equivalent traffic conflict - Google Patents
Method for testing safety performance of unsignalized intersection by utilizing equivalent traffic conflict Download PDFInfo
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- CN102592448A CN102592448A CN2012100160533A CN201210016053A CN102592448A CN 102592448 A CN102592448 A CN 102592448A CN 2012100160533 A CN2012100160533 A CN 2012100160533A CN 201210016053 A CN201210016053 A CN 201210016053A CN 102592448 A CN102592448 A CN 102592448A
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Abstract
The invention discloses a method for testing safety performance of an unsignalized intersection by utilizing equivalent traffic conflict, belonging to the field of managing road traffic. The method comprises the following steps of: firstly determining a generation type of traffic conflict of unsignalized intersection, namely intersection conflict, merging conflict and diverging conflict; and guiding different types of traffic conflict probability distribution and expected traffic conflict severity degree, obtaining practical hour conflict amount of an intersection by utilizing a VEVID (Vehicle Video Capture Data Collector) video processing software, constructing an equivalent traffic conflict amount of the intersection based on the obtained practical hour conflict amount as an index for testing the safety of the unsignalized intersection, and finally obtaining the tested grade of the safety of the unsignalized intersection through statistic analysis. According to the method for testing the safety performance of the unsignalized intersection by utilizing the equivalent traffic conflict, disclosed by the invention, time period of test can be favorably shortened, the efficiency and the precision of the test are improved, the degree of automation is high, no influence of personal factors exists, the reliability of the test is high, a large amount of data samples can be objectively and quickly obtained, and reliable data base is provided for probability statistic analysis.
Description
Technical field
The present invention relates to a kind of security performance of utilizing the equivalent traffic conflict test and appraisal unsignalized intersection between vehicle; To reach in a short time fast, accurately to judge the security level of unsignalized intersection; For the genetic analysis of carrying out the easy crossing of accident also proposes to improve countermeasure accordingly scientific basis is provided, belongs to the control of traffic and road field.
Background technology
Traffic safety problem has become the common major issue of paying close attention in countries in the world; In recent years because the increase of vehicle population; Traffic safety accident quantity is also ceaselessly rising; Unsignalized intersection has compiled the traffic from all directions as the hinge of road user conversion travel route, and its safety problem can not be ignored especially.Traffic conflict is meant under observable condition; Two or more road users at one time, approaching each other on the space; So that if either party does not take measures to change its undesired traffic behavior; As change travel direction, reduce the speed of a motor vehicle, stop and wait for etc., the danger that will bump.Equivalent traffic conflict is dissimilar traffic conflict and is converted into certain traffic conflict amount by certain conversion factor.The essence of traffic conflict is the form of expression of traffic behavior unsafe factor; Its development both possibly cause the generation of traffic hazard; Also possibly avoid accident to take place because of taking hedging behavior timely; Accident and traffic conflict exist very similar form, and the unique difference of the two is whether to have taken place the consequence of direct infringement property.Research both at home and abroad shows that accident and traffic conflict have linear characteristic and is certain rules property, and the two has the strong correlation relation, and traffic conflict has replaceability to accident.
Crossing security performance evaluation in the past mainly comprises based on the evaluation method of traffic hazard with based on the evaluation method of traffic conflict.Because the unobservable property of the randomness of traffic hazard, the imperfection property of data system, cycle length and accident etc., the efficient that causes testing and assessing is low, and effect is limited on crossing safety evaluation problem; And the method for The traffic conflict technique mainly concentrates on the method based on conflict point, collision rate at present, does not consider that the seriousness of dissimilar conflicts is different, and the damage sequence that brings is also different, and its evaluation method precision is relatively poor.If can seek a kind of mode, the large-scale statistical number can either be obtained fast, accidents hazardous characteristic can be embodied again, then can significantly improve the efficient and the confidence level of test and appraisal crossing security performance.
Summary of the invention
Technical matters: the invention provides a kind of method of utilizing equivalent traffic conflict test and appraisal unsignalized intersection security performance; Can be according to when satisfying discrimination precision; The shortening accident is prone to send out the test and appraisal cycle of crossing; Realize the purpose of the quick evaluation of crossing, strong foundation is provided for the traffic safety measure improves to reach to vehicle supervision department assesses the crossing security performance.
Technical scheme: for achieving the above object, the present invention realizes through following technical scheme:
A kind of method of utilizing equivalent traffic conflict test and appraisal unsignalized intersection security performance is characterized in that the concrete steps of said method are:
Step 1: confirm crossing traffic conflict type, comprise and intersect conflict, interflow conflict and shunt conflict, wherein,
The traffic conflict that the conflict that intersects is meant that the wagon flow of two different directions produces because of the intersection behavior of passing through,
The interflow conflict is meant the traffic conflict that the traffic convergence of two different directions produces when becoming one wagon flow,
Shunting conflict is meant the traffic conflict that the wagon flow of a direction takes place when being divided into the wagon flow of two different directions;
Step 2: calculate the probability that all types of traffic conflicts take place, establish P
1For intersecting the probability that conflicts and take place, P
2Be the probability that the interflow conflict takes place, P
3Probability for the shunting conflict takes place, satisfy following formula:
Wherein, X
sBe safety critical spacing accumulated probability between vehicle, Y
cBe the critical gap accumulated probability of intersecting between vehicle, Y
mBe the critical gap accumulated probability between the vehicle of interflow, Y
dBe the probability of telling between the shunting vehicle,
The probability of telling between the critical gap accumulated probability between vehicle between safety critical spacing accumulated probability, intersection vehicle, the critical gap accumulated probability between the vehicle of interflow, shunting vehicle uses VEVID (Vehicle Video-Capture Data Collector) Video processing software to obtain;
Step 3: make up dissimilar expectation traffic conflict order of severity index S
i, satisfy following formula:
S
i＝P
i×B
i，i＝1，2，3 (4)
P
iBe the probability that dissimilar traffic conflicts take place, B
iThe order of severity that causes after bumping for dissimilar traffic conflicts,
S
1, S
2, S
3Be respectively the expectation order of severity index of intersection, interflow and shunting conflict,
B
1, B
2, B
3Be respectively the order of severity after intersection, interflow and shunting conflict bump, get normal value B
1Be 0.0991, B
2Be 0.0078, B
3Be 0.0078;
Step 4: calculate unsignalized intersection equivalent traffic conflict amount N, satisfy following formula:
Wherein, N
1, N
2, N
3Be respectively intersection, interflow and shunting amount of collisions, intersect, collaborate and shunt amount of collisions and use VEVID Video processing software to obtain;
Step 5: safe class is divided, and comprises 1～4 level security grade, through comprehensive evaluating, confirms that the standard of each grade of unsignalized intersection security is following:
Safe class is 1 grade standard U
1For: N≤600;
Safe class is 2 grades standard U
2For: 600＜N≤1000;
Safe class is 3 grades standard U
3For: 1000＜N≤1450;
Safe class is 4 grades standard U
4For: N＞1450;
Wherein, unsignalized intersection equivalent traffic conflict amount N is the test and appraisal factor, U
1～U
4Be level Four evaluation standard, U
1, U
2, U
3, U
4Being respectively safe class is the standard value of 1,2,3,4 grade the test and appraisal factor, and the security of safe class 1 is the highest, and the security of safe class 4 is minimum;
Step 6: if crossing equivalent traffic conflict amount drops on U
mThe zone, m=1,2,3,4, then the safe class of this crossing is corresponding m level.
Compared with prior art, the invention has the beneficial effects as follows:
1. utilize crossing equivalent amount of collisions test and appraisal unsignalized intersection security performance,, draw the equivalent traffic conflict amount of crossing to be tested and assessed through introducing crossing traffic conflict probability and dissimilar traffic conflict accident back order of severity ratio; Relatively the equivalent traffic conflict amount of this crossing and evaluation standard value; The test and assess safe class of this crossing, the accident that satisfies the zonule is prone to send out the test and appraisal requirement of crossing, helps shortening the time cycle of test and appraisal; Improve the efficient and the precision of test and appraisal; And then accident be prone to is sent out a crossing carry out genetic analysis, proposition improves countermeasure accordingly fast, improves the intersection traffic safety.
2. the observation and the disposal route of crossing critical gap accumulated probability and crossing traffic conflict; Increasingly automated, do not receive the interference of human factor, detecting reliability is high; Can obtain the mass data sample objectively, fast, for probability statistical analysis provides reliable data basis.
Description of drawings
Fig. 1 is a unsignalized intersection security performance assessing method process flow diagram of the present invention.
Embodiment
As shown in Figure 1, a kind of method of utilizing equivalent traffic conflict test and appraisal unsignalized intersection security performance, the concrete steps of said method are:
Step 1: confirm crossing traffic conflict type, comprise and intersect conflict, interflow conflict and shunt conflict, wherein,
The wagon flow that the conflict that intersects is meant two different directions the traffic conflict that behavior produced such as passes through because of intersection,
The interflow conflict is meant the traffic conflict that the traffic convergence of two different directions produces when becoming one wagon flow,
Shunting conflict is meant the traffic conflict that the wagon flow of a direction takes place when being divided into the wagon flow of two different directions.
Step 2: calculate the probability that all types of traffic conflicts take place, establish P
1For intersecting the probability that conflicts and take place, P
2Be the probability that the interflow conflict takes place, P
3Probability for the shunting conflict takes place, satisfy following formula:
Wherein:
X
s: be safety critical spacing accumulated probability between vehicle;
Y
c: be the critical gap accumulated probability of intersecting between vehicle;
Y
m: be the critical gap accumulated probability between the vehicle of interflow;
Y
d: be the probability of telling between the shunting vehicle;
Use VEVID (Vehicle Video-Capture Data Collector) Video processing software can obtain safety critical spacing accumulated probability between vehicle, intersect the probability of telling between critical gap accumulated probability between vehicle, the critical gap accumulated probability between the vehicle of interflow, shunting vehicle.
Step 3: make up dissimilar expectation traffic conflict order of severity index S
i, satisfy following formula:
S
i＝P
i×B
i (i＝1，2，3) (4)
P
iBe the probability that dissimilar traffic conflicts take place, B
iThe order of severity that causes after bumping for dissimilar traffic conflicts,
S
1, S
2, S
3Be respectively the expectation order of severity index of intersection, interflow and shunting conflict,
B
1, B
2, B
3Be respectively the order of severity after intersection, interflow and shunting conflict bump, get normal value B
1Be 0.0991, B
2Be 0.0078, B
3Be 0.0078.
Step 4: calculate unsignalized intersection equivalent traffic conflict amount N, satisfy following formula:
N
1, N
2, N
3Be respectively intersection, interflow and shunting amount of collisions, use VEVID Video processing software can obtain intersection conflict, interflow conflict and shunting amount of collisions, the number of times that promptly conflicts.
Step 5: safe class is divided, and comprises 1～4 level security grade, through comprehensive evaluating, confirms that the standard of each grade of unsignalized intersection security is following:
Safe class is 1 grade standard U
1For: N≤600;
Safe class is 2 grades standard U
2For: 600＜N≤1000;
Safe class is 3 grades standard U
3For: 1000＜N≤1450;
Safe class is 4 grades standard U
4For: N＞1450;
Wherein, unsignalized intersection equivalent traffic conflict amount N is the test and appraisal factor, U
1～U
4Be level Four evaluation standard, U
1, U
2, U
3, U
4Being respectively safe class is the standard value of 1,2,3,4 grade the test and appraisal factor, and the security of safe class 1 is the highest, and the security of safe class 4 is minimum;
Step 6: if crossing equivalent traffic conflict amount drops on U
mThe zone, m=1,2,3,4, then the safe class of this crossing is corresponding m level.
Below in conjunction with the traffic conflict enquiry data, the present invention is further specified:
Using VEVID Video processing software can obtain the number of times that intersects conflict, collaborates conflict and shunting conflict, is the decision criteria of traffic conflict below:
Crossing traffic conflict comprises intersecting and conflicts, collaborates to conflict, shunt conflict that the decision criteria of various traffic conflicts is following, adds up the number of times of every kind of traffic conflict generation, and through type (5) obtains crossing equivalent traffic conflict amount N.
Utilize conflict direction difference as judgment basis, the conflict that intersects is that the wagon flow of two different directions is intersected the traffic conflict when passing through each other,
Utilize conflict direction difference as judgment basis, the interflow conflict is the traffic conflict of the traffic convergence of two different directions when becoming one wagon flow,
Utilize conflict direction difference as judgment basis, the traffic conflict the when wagon flow of a direction of shunting conflict is divided into two different directions.
Example: selection S122 provincial highway pile No. is that a unsignalized intersection at k10 place is a research object of the present invention; Continuous 8 hours traffic conflict observation is carried out in this crossing; Taked based on the traffic conflict of video technique and the automatic testing method of critical gap accumulated probability, finishing analysis the accumulated probability of crossing critical gap, the critical gap accumulated probability of intersecting between vehicle is 0.43; Critical gap accumulated probability between the vehicle of interflow is 0.4; Safety critical spacing accumulated probability is 0.75 between vehicle, and telling probability between vehicle is 0.17, actual hour traffic conflict amount N
iObtain through VEVID software, as shown in the table:
According to (1)-(3) formula, obtain intersecting collision probability P
1=0.51, interflow collision probability P
2=0.43, shunting collision probability P
3=0.29,
According to formula 4 and formula 5, equivalent traffic conflict amount can be obtained, and then crossing equivalent traffic conflict amount N=1285 always can be got, drop on U
3In the zone, the safe class of this crossing of therefore can testing and assessing is 3, and traffic safety hidden danger is bigger, and potential dangerous higher in this crossing need be taked the improvement measure, prevents the generation of traffic hazard.
Claims (1)
1. method of utilizing equivalent traffic conflict test and appraisal unsignalized intersection security performance is characterized in that the concrete steps of said method are:
Step 1: confirm crossing traffic conflict type, comprise and intersect conflict, interflow conflict and shunt conflict, wherein,
The traffic conflict that the conflict that intersects is meant that the wagon flow of two different directions produces because of the intersection behavior of passing through,
The interflow conflict is meant the traffic conflict that the traffic convergence of two different directions produces when becoming one wagon flow,
Shunting conflict is meant the traffic conflict that the wagon flow of a direction takes place when being divided into the wagon flow of two different directions;
Step 2: calculate the probability that all types of traffic conflicts take place, establish
P 1 Be the probability of intersection conflict generation,
P 2 Be the probability of interflow conflict generation,
P 3 Probability for the shunting conflict takes place, satisfy following formula:
Wherein,
X s Be safety critical spacing accumulated probability between vehicle,
Y c Be the critical gap accumulated probability of intersecting between vehicle,
Y m Be the critical gap accumulated probability between the vehicle of interflow,
Y d Be the probability of telling between the shunting vehicle,
The probability of telling between the critical gap accumulated probability between vehicle between safety critical spacing accumulated probability, intersection vehicle, the critical gap accumulated probability between the vehicle of interflow, shunting vehicle uses VEVID Video processing software to obtain;
Step 3: make up dissimilar expectation traffic conflict order of severity indexs
S i , satisfy following formula:
(4)
P i Be the probability of dissimilar traffic conflicts generations,
B i The order of severity that causes after bumping for dissimilar traffic conflicts,
S 1 , S 2 , S 3 Be respectively the expectation order of severity index of intersection, interflow and shunting conflict,
B 1 ,
B 2 ,
B 3 Be respectively the order of severity after intersection, interflow and shunting conflict bump, get normal value
B 1 Be 0.0991,
B 2 Be 0.0078,
B 3 Be 0.0078;
Step 4: calculate unsignalized intersection equivalent traffic conflict amount
N, satisfy following formula:
Wherein,
N 1 ,
N 2 ,
N 3 Be respectively intersection, interflow and shunting amount of collisions, intersect, collaborate and shunt amount of collisions and use VEVID Video processing software to obtain;
Step 5: safe class is divided, and comprises 1 ~ 4 level security grade, through comprehensive evaluating, confirms that the standard of each grade of unsignalized intersection security is following:
Safe class is 1 grade a standard
U 1 For:
N≤600;
Safe class is 2 grades a standard
U 2 For: 600＜
N≤1000;
Safe class is 3 grades a standard
U 3 For: 1000＜
N≤1450;
Safe class is 4 grades a standard
U 4 For:
N＞1450;
Wherein, unsignalized intersection equivalent traffic conflict amount
NBe the test and appraisal factor,
U 1 ～
U 4 Be the level Four evaluation standard,
U 1 ,
U 2 ,
U 3 ,
U 4 Being respectively safe class is the standard value of 1,2,3,4 grade the test and appraisal factor, and the security of safe class 1 is the highest, and the security of safe class 4 is minimum;
Step 6: if crossing equivalent traffic conflict amount drops on
U m The zone,
m=1,2,3,4, then the safe class of this crossing is corresponding
mLevel.
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| CN103093622A (en) * | 2013-01-09 | 2013-05-08 | 东南大学 | Prediction method of urban road signalized intersection motor and non-motor traffic conflict number |
| CN105139677A (en) * | 2015-07-28 | 2015-12-09 | 苏州大学张家港工业技术研究院 | Uncontrolled intersection vehicle passing guiding system based on cooperative vehicle infrastructure and guiding method thereof |
| CN107248290A (en) * | 2017-07-14 | 2017-10-13 | 东南大学 | The hybrid mainline toll station traffic conflict evaluation method recognized based on automobile video frequency |
| CN108389430A (en) * | 2018-01-12 | 2018-08-10 | 南京理工大学 | A kind of intersection pedestrian based on video detection and collision of motor-driven vehicles prediction technique |
| CN109035784A (en) * | 2018-09-17 | 2018-12-18 | 江苏智通交通科技有限公司 | Dynamic wagon flow OD estimation method based on multi-source heterogeneous data |
| CN109326121A (en) * | 2017-07-31 | 2019-02-12 | 交通运输部公路科学研究所 | Highway construction area upstream vehicle cocurrent control method |
| CN109979212A (en) * | 2019-04-08 | 2019-07-05 | 河海大学 | Determination method is arranged based on equivalent number of collisions highway intersection signal lamp in one kind |
| WO2020000794A1 (en) * | 2018-06-27 | 2020-01-02 | 华南理工大学 | Method for quickly determining mixed traffic conflict situation |
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| CN103093622A (en) * | 2013-01-09 | 2013-05-08 | 东南大学 | Prediction method of urban road signalized intersection motor and non-motor traffic conflict number |
| CN105139677A (en) * | 2015-07-28 | 2015-12-09 | 苏州大学张家港工业技术研究院 | Uncontrolled intersection vehicle passing guiding system based on cooperative vehicle infrastructure and guiding method thereof |
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| CN109326121A (en) * | 2017-07-31 | 2019-02-12 | 交通运输部公路科学研究所 | Highway construction area upstream vehicle cocurrent control method |
| CN108389430A (en) * | 2018-01-12 | 2018-08-10 | 南京理工大学 | A kind of intersection pedestrian based on video detection and collision of motor-driven vehicles prediction technique |
| CN108389430B (en) * | 2018-01-12 | 2021-02-26 | 南京理工大学 | Intersection pedestrian and motor vehicle collision prediction method based on video detection |
| WO2020000794A1 (en) * | 2018-06-27 | 2020-01-02 | 华南理工大学 | Method for quickly determining mixed traffic conflict situation |
| CN109035784A (en) * | 2018-09-17 | 2018-12-18 | 江苏智通交通科技有限公司 | Dynamic wagon flow OD estimation method based on multi-source heterogeneous data |
| CN109035784B (en) * | 2018-09-17 | 2021-01-26 | 江苏智通交通科技有限公司 | Dynamic traffic flow OD estimation method based on multi-source heterogeneous data |
| CN109979212A (en) * | 2019-04-08 | 2019-07-05 | 河海大学 | Determination method is arranged based on equivalent number of collisions highway intersection signal lamp in one kind |
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Application publication date: 20120718 |