CN109979212A - Determination method is arranged based on equivalent number of collisions highway intersection signal lamp in one kind - Google Patents
Determination method is arranged based on equivalent number of collisions highway intersection signal lamp in one kind Download PDFInfo
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Abstract
The invention discloses one kind to be arranged determination method based on equivalent number of collisions highway intersection signal lamp, the highway intersection of non-mandrel roller is chosen as research object, the main roads and secondary road in highway intersection are distinguished according to motor vehicle flow, the highest one-way volume of flow in the two-way traffic amount and secondary road of main roads is obtained by field observation；Motor vehicle flow and wagon flow number of collisions, the relationship of accident number and traffic conflict seriousness theory based on highway intersection obtain i.e. motor vehicle signal lamp installation warrants flow diagram；The two-way traffic amount coordinate points for investigating resulting main roads before are marked in motor vehicle signal lamp installation warrants flow diagram, if the coordinate points are fallen in above curve, traffic lights is set, otherwise are not provided with.The present invention has comprehensively considered wagon flow number of collisions and the relationship of flow, accident number calculates signal warrant flow value using Critical Equivalent number of collisions, keeps motor vehicle signal lamp installation warrants conclusion more accurate and fitting reality.
Description
Technical field
The present invention relates to one kind to be arranged determination method based on equivalent number of collisions highway intersection signal lamp, belongs to road traffic
Management and traffic safety technology field.
Background technique
With the sustainable development of Chinese national economy and deepening continuously for Development of China's Urbanization, the function and feature of highway are opened
Begin slowly to change to urban road, the contradiction of the tale quale and both ever-increasing transport needs that lead to highway is increasingly prominent
Out, throat position of the Highway intersections as highway network even more carries shunting, steering and collecting and distributing important work
With, but often cause traffic delay serious, conflict frequency due to lacking effective traffic control measure in these highway intersections
Hair, and it is to improve the highway intersection traffic capacity, avoid the jams and reduce traffic thing that motor vehicle signal lamp, which is rationally arranged,
Therefore one of effective means.
Intersections research was considered mainly in terms of delay and accident number two in the past, such as the U.S.
" Uniform Traffic control facility detailed rules and regulations " in by 8 hourly traffic volumes, 4 hourly traffic volumes, peak hour traffic, accident record etc.
As installation warrants, but the traffic composition due to the no signal highway intersection in China and road conditions are complicated, with the U.S. have compared with
Big difference, so can not be directly using the standard in the U.S. as the installation warrants of highway in China usual friendship message signal lamp；China is newest
GB14886-2016 " road traffic signal lamp setting and installation specification " combine the actual conditions in China, comprehensively consider peak
Hour flow, the installation warrants of the indexs as signal lamp such as the motor vehicle hour flow of arbitrary continuation 8h, traffic accident condition, but
Traffic accident number makes it suffer restraints in use as installation warrants due to obtaining difficult and lacking timeliness；Yang Xiaoguang etc.
People is based on traffic conflict analysis and establishes intersection motor vehicle signal light installation warrants, but only analyzes number of collisions and flow
Relationship, have ignored this key factor of accident number, and the difference due to not considering various traffic conflict seriousness completely, lead
The calculated result of critical number of collisions is caused to be deviated.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the deficiencies of existing technologies, provide a kind of public based on equivalent number of collisions
Determination method is arranged in road usual friendship message signal lamp, analyzes the wagon flow number of collisions of highway intersection and the pass of motor vehicle flow, accident number
System, highway intersection motor vehicle signal lamp setting demand providing quick, the non-accident of one kind, considering conflict seriousness are sentenced
Determine method.This method not only overcomes collects too long disadvantage traffic accident one number time, it is also contemplated that the seriousness of conflict makes
The acquisition of number of collisions is more accurate and tallies with the actual situation, for highway intersection traffic control provide it is quick succinct motor-driven
Vehicle signal warrant.
In order to achieve the above objectives, the present invention provides a kind of based on equivalent number of collisions highway intersection signal lamp setting judgement side
Method, comprising the following steps:
(1), the highway intersection of no signal lamp control is chosen as research object, and it is flat to distinguish highway according to motor vehicle flow
The motor vehicle flow of main roads and secondary road in one voice, main roads is greater than secondary road, is obtained by field observation
Take the two-way traffic amount X that main roads are total in observation timeAlwaysAnd secondary road daily traffic volume Y in observation timeAlways, secondary road
Daily traffic volume YAlwaysIt is the highest entrance driveway of one-way volume in each secondary road in each unit hour in observation time
The summation of one-way volume；
(2), serious based on the motor vehicle flow of highway intersection and wagon flow number of collisions, the relationship of accident number and traffic conflict
Property theory obtains the rectangular coordinate system figure i.e. motor vehicle signal lamp installation warrants flow curve figure of main roads and secondary road；
(3), by the two-way traffic amount X of main roads in step (1)AlwaysDoing average treatment divided by observation time, to obtain highway flat
Main roads hourly traffic volume X with one voice?；Secondary road daily traffic volume YAlwaysDoing average treatment divided by observation time, to obtain per unit small
When the interior highest unidirectional mean hours volume of traffic Y of secondary road?, by highway intersection main roads hourly traffic volume X?With it is secondary
The highest unidirectional mean hours volume of traffic Y of road?The two-dimensional coordinate point of composition is marked in motor vehicle signal lamp installation warrants flow
In curve graph, if the coordinate points are fallen in above curve, traffic lights are set in the highway intersection；Conversely, not at this
Traffic lights are arranged in highway intersection
Preferentially, step (2) the following steps are included:
(21) according to the relationship of the motor vehicle flow of highway intersection and wagon flow collision probability, the vehicle of highway intersection is established
Flow collision probability computation model pijAre as follows:
Wherein, i=1,2,3,4 sequences indicate four entrance marks of highway intersection, j=1, and 2,3 sequences indicate, is straight
Row and three kinds of vehicles of turning right flow to mark, such as ij indicates that i entrance j kind flows to vehicle, and mn indicates that vehicle corresponding with ij rushes
Prominent flows to vehicle mark from m entrance n kind, away from λ is for vehicle in unit Min-conflicts away from interior average when H is Min-conflicts
Arrival rate (pcu/s)；
(22) it is based on traffic conflict seriousness conclusion, is obtained: intersection conflict: interflow conflict: shunting conflict=1:0.079:
0.079,
It can thus be concluded that all number of collisions are scaled equivalent intersection conflict number are as follows:
Wherein, TWhenFor all conflict points at highway intersection in total equivalent traffic conflictcount, that is, unit hour
Mesh, TIt hands overFor total all intersection conflict point numbers intersected in hour number of collisions, that is, unit hour at highway intersection, TPointFor
Total all diverging conflicts numbers shunted in traffic hour number of collisions, that is, unit hour at highway intersection, TIt closesIt is total
Collaborate all interflow numbers of conflict in hour number of collisions, that is, unit hour at highway intersection.
Preferentially, step (2) the following steps are included:
(23) it due to the collection excessive cycle of volume of traffic accident number, calculates for convenience, using traffic volume forecast accident number
Generating polynomial calculate the volume of traffic, generating polynomial are as follows:
Wherein, C is the critical traffic accident number of highway intersection in 1 year, and general value is 5, XdIt is the traffic of main roads day
Measure total two-way traffic amount of main roads in (pcu/d) i.e. 24 hour, YdIt is that secondary road daily traffic volume (pcu/d) i.e. 24 is small
When interior secondary road total two-way traffic amount, X is highway intersection main roads hourly traffic volume (pcu/h), and Y is time thoroughfare
Road hourly traffic volume (pcu/h).
Preferentially, step (2) the following steps are included:
(24) the total equivalent traffic conflictcount T calculated by comparison discovery using theoretical formula (2)WhenWith field observation
To total the having differences property of number of collisions of highway intersection, in order to improve the accuracy of signal warrant, what is taken is other
Multiple highway intersection actual observations to total equivalent traffic conflictcount for being obtained with theoretical calculation of total number of collisions unite
Meter analysis obtains the relational expression of the total equivalent traffic conflictcount and practical total number of collisions in theoretical calculation are as follows:
Wherein, V is vehicle flowrate total at highway intersection in highway intersection hour total flow, that is, unit hour, and unit is
(pcu/h)；
(25) when main roads hourly traffic volume X is 800, the control of no signal lamp is calculated using formula (2) (3) (4)
Total practical equivalent hour number of collisions T at highway intersectionIt is practical, relationship is obtained with secondary road hourly traffic volume Y Fitting Analysis
Formula are as follows: Y=4 × 10-7-0.0004TIt is practical 2+0.5689TIt is practical+ 47.427, related coefficient 0.97；
When X using 100/h as step pitch when 500-1800, being incremented by, it is corresponding to calculate each X using formula (2) (3) (4)
Total practical equivalent hour number of collisions T at the highway intersection of no signal lamp controlIt is practicalWith secondary road hourly traffic volume Y's
Total 14 relation functions find the peak of curve of 14 relation functions by the peak value comparative studies to 14 relation functions
Between 145-150, equivalent hour number of collisions T is determinedIt is practicalFor 145 times and it is defined as Critical Equivalent hour number of collisions TFace。
Preferentially, step (2) the following steps are included:
(26) by Critical Equivalent hour number of collisions TFaceSubstitute into practical equivalent hour number of collisions T in step (2)It is practicalWith secondary thoroughfare
The relation function of road hourly traffic volume Y, be calculated main roads hourly traffic volume X 500-1800, with 100/h for step
Away from it is incremental when secondary road critical traffic volume YFace, using each main roads hourly traffic volume X value with it is corresponding secondary
Road critical traffic volume YFaceValue fitting building motor vehicle signal lamp installation warrants flow curve.
Preferentially, in step (21),
Assuming that the arrival rate of two-phase conflict traffic A and wagon flow B existing for highway intersection obey Poisson distribution, it is assumed that highway
Usual friendship mouth vehicle from stop line to conflict point between running time h band together tracking away from H when being all equal to Min-conflicts and without vehicle
Into intersection, then wagon flow A and wagon flow B are clashed within h Probability pPunchingFor the two-phase conflict traffic vehicle within this time
To vehicle number >=product of 1 probability, it may be assumed that
pPunching=pa(k≥1)·pb(k≥1) (1-1)
Wherein, pPunchingThe probability clashed for wagon flow A and wagon flow B；
pa(k≥1)、pb(k >=1) is respectively wagon flow A, wagon flow the B interior probability for arriving vehicle number k >=1 between the h time；
Taking h value is 5 seconds, and the probability approximation of p (k > 1) is approximately equal to zero, and formula (1-1) can be write as:
pPunching=pa(k=1) pb(k=1) (1-2)
Poisson distribution is obeyed because vehicle reaches, therefore is had:
In the highway intersection of no signal lamp control, some wagon flow vehicle clashes general within the △ t=h=H time
Rate is the sum of the probability that it is clashed with each phase conflict traffic vehicle respectively, obtains formula after formula (1-3) is arranged are as follows:
Preferentially, away from value 5s when H is Min-conflicts.
Advantageous effects of the invention:
The present invention has comprehensively considered the wagon flow number of collisions of highway intersection and the relationship of flow, accident number, avoids only
It studies the relationship of number of collisions and flow by accident number or only to determine the deficiency of signal warrant, and is rushed based on traffic
Prominent seriousness theory introduces the concept of equivalent number of collisions, and signal warrant flow is calculated using Critical Equivalent number of collisions
Value, keeps motor vehicle signal lamp installation warrants conclusion more accurate and fitting reality, in addition makes in the form of flow is according to figure motor-driven
The setting judgement of vehicle signal lamp is concise, with good application prospect.
Detailed description of the invention
Fig. 1 is flow chart of the invention；
Fig. 2 is the schematic diagram of typical highway usual friendship mouth conflict point and the form that conflicts；
Fig. 3 is highway intersection motor vehicle signal lamp installation warrants flow diagram；
Fig. 4 is the relation function figure of secondary road a certain entrance driveway flow and practical equivalent hour number of collisions；
Fig. 5 is G104 and pa Weir road highway intersection geometrical condition status figure；
Fig. 6 is that the motor vehicle signal lamp of 104 national highways and one urban road highway intersection of Nanjing Suburb is arranged in embodiment
According to analysis schematic diagram.
Specific embodiment
The following examples are only intended to illustrate the technical solution of the present invention more clearly, and cannot be used as a limitation the limitation present invention
Protection scope.
Determination method is arranged based on equivalent number of collisions highway intersection signal lamp in one kind, comprising the following steps:
(1), the highway intersection of no signal lamp control is chosen as research object, and it is flat to distinguish highway according to motor vehicle flow
The motor vehicle flow of main roads and secondary road in one voice, main roads is greater than secondary road, is obtained by field observation
Take the two-way traffic amount X that main roads are total in observation timeAlwaysAnd secondary road daily traffic volume Y in observation timeAlways, secondary road
Daily traffic volume YAlwaysIt is the highest entrance driveway of one-way volume in each secondary road in each unit hour in observation time
The summation of one-way volume；
(2), serious based on the motor vehicle flow of highway intersection and wagon flow number of collisions, the relationship of accident number and traffic conflict
Property theory obtains the rectangular coordinate system figure i.e. motor vehicle signal lamp installation warrants flow curve figure of main roads and secondary road；
(3), by the two-way traffic amount X of main roads in step (1)AlwaysDoing average treatment divided by observation time, to obtain highway flat
Main roads hourly traffic volume X with one voice?；Secondary road daily traffic volume YAlwaysDoing average treatment divided by observation time, to obtain per unit small
When the interior highest unidirectional mean hours volume of traffic Y of secondary road?, by highway intersection main roads hourly traffic volume X?With it is secondary
The highest unidirectional mean hours volume of traffic Y of road?The two-dimensional coordinate point of composition is marked in motor vehicle signal lamp installation warrants flow
In curve graph, if the coordinate points are fallen in above curve, traffic lights are set in the highway intersection；Conversely, not at this
Traffic lights are arranged in highway intersection.
Further, step (2) the following steps are included:
(21) according to the relationship of the motor vehicle flow of highway intersection and wagon flow collision probability, the vehicle of highway intersection is established
Flow collision probability computation model pijAre as follows:
Wherein, i=1,2,3,4 sequences indicate four entrance marks of highway intersection, j=1, and 2,3 sequences indicate, is straight
Row and three kinds of vehicles of turning right flow to mark, such as ij indicates that i entrance j kind flows to vehicle, and mn indicates that vehicle corresponding with ij rushes
Prominent flows to vehicle mark from m entrance n kind, away from λ is for vehicle in unit Min-conflicts away from interior average when H is Min-conflicts
Arrival rate (pcu/s)；
(22) Fig. 2 highway intersection conflict form schematic diagram is combined, traffic conflict seriousness conclusion is based on, obtains: intersecting
Conflict: interflow conflict: shunting conflict=1:0.079:0.079,
It can thus be concluded that all number of collisions are scaled equivalent intersection conflict number are as follows:
Wherein, TWhenFor all conflict points at highway intersection in total equivalent traffic conflictcount, that is, unit hour
Mesh, TIt hands overFor total all intersection conflict point numbers intersected in hour number of collisions, that is, unit hour at highway intersection, TPointFor
Total all diverging conflicts numbers shunted in traffic hour number of collisions, that is, unit hour at highway intersection, TIt closesIt is total
Collaborate all interflow numbers of conflict in hour number of collisions, that is, unit hour at highway intersection.
Further, step (2) the following steps are included:
(23) it due to the collection excessive cycle of volume of traffic accident number, calculates for convenience, using traffic volume forecast accident number
Generating polynomial calculate the volume of traffic, generating polynomial are as follows:
Wherein, C is the critical traffic accident number of highway intersection in 1 year, and general value is 5, XdIt is the traffic of main roads day
Measure total two-way traffic amount of main roads in (pcu/d) i.e. 24 hour, YdIt is that secondary road daily traffic volume (pcu/d) i.e. 24 is small
When interior secondary road total two-way traffic amount, X is highway intersection main roads hourly traffic volume (pcu/h), and Y is time thoroughfare
Road hourly traffic volume (pcu/h).
Further, step (2) the following steps are included:
(24) the total equivalent traffic conflictcount T calculated by comparison discovery using theoretical formula (2)WhenWith field observation
To total the having differences property of number of collisions of highway intersection taken as shown in Figure 3 to improve the accuracy of signal warrant
Other multiple highway intersection actual observations to total number of collisions and the obtained total equivalent traffic conflict of theoretical calculation
Number is for statistical analysis, obtains the relational expression of the total equivalent traffic conflictcount and practical total number of collisions in theoretical calculation are as follows:
Wherein, V is vehicle flowrate total at highway intersection in highway intersection hour total flow, that is, unit hour, and unit is
(pcu/h)；
(25) when main roads hourly traffic volume X is 800, the control of no signal lamp is calculated using formula (2) (3) (4)
Total practical equivalent hour number of collisions T at highway intersectionIt is practical, relationship is obtained with secondary road hourly traffic volume Y Fitting Analysis
Formula are as follows: Y=4 × 10-7-0.0004TIt is practical 2+0.5689TIt is practical+ 47.427, related coefficient 0.97；
When X using 100/h as step pitch when 500-1800, being incremented by, it is corresponding to calculate each X using formula (2) (3) (4)
Total practical equivalent hour number of collisions T at the highway intersection of no signal lamp controlIt is practicalWith secondary road hourly traffic volume Y's
Total 14 relation functions find the peak of curve of 14 relation functions by the peak value comparative studies to 14 relation functions
Between 145-150, equivalent hour number of collisions T is determinedIt is practicalFor 145 times and it is defined as Critical Equivalent hour number of collisions TFace。
Further, step (2) the following steps are included:
(26) by Critical Equivalent hour number of collisions TFaceSubstitute into practical equivalent hour number of collisions T in step (2)It is practicalWith secondary thoroughfare
The relation function of road hourly traffic volume Y, be calculated main roads hourly traffic volume X 500-1800, with 100/h for step
Away from it is incremental when secondary road critical traffic volume YFace, using each main roads hourly traffic volume X value with it is corresponding secondary
Road critical traffic volume YFaceValue fitting building motor vehicle signal lamp installation warrants flow curve.
Further, in step (21),
Assuming that the arrival rate of two-phase conflict traffic A and wagon flow B existing for highway intersection obey Poisson distribution, it is assumed that highway
Usual friendship mouth vehicle from stop line to conflict point between running time h band together tracking away from H when being all equal to Min-conflicts and without vehicle
Into intersection, then wagon flow A and wagon flow B are clashed within h Probability pPunchingFor the two-phase conflict traffic vehicle within this time
To vehicle number >=product of 1 probability, it may be assumed that
pPunching=pa(k≥1)·pb(k≥1) (1-1)
Wherein, pPunchingThe probability clashed for wagon flow A and wagon flow B；
pa(k≥1)、pb(k >=1) is respectively wagon flow A, wagon flow the B interior probability for arriving vehicle number k >=1 between the h time；
Taking h value is 5 seconds, and the probability approximation of p (k > 1) is approximately equal to zero, and formula (1-1) can be write as:
pPunching=pa(k=1) pb(k=1) (1-2)
Poisson distribution is obeyed because vehicle reaches, therefore is had:
In the highway intersection of no signal lamp control, some wagon flow vehicle clashes general within the △ t=h=H time
Rate is the sum of the probability that it is clashed with each phase conflict traffic vehicle respectively, obtains formula after formula (1-3) is arranged are as follows:
Further, away from value 5s when H is Min-conflicts.
104 national highways are selected to be investigated and analysed with one urban road of Nanjing Suburb (pa Weir road) for research object, wherein
104 national highways are main roads, and pa Weir road is secondary road, which belongs to without control, cross intersection, status
As shown in Figure 5.
Step S1: the magnitude of traffic flow of the highway intersection is investigated, this example is using tachymeter to main roads, secondary road
It is investigated, control time is the volume of traffic of 7:00-19:00 continuous 12 hours, obtains summarizing data as shown in table 1.
1 G104 of table and 12 hourly traffic volume summary sheet (pcu) of pa Weir road usual friendship mouth motor vehicle
| Period | Main roads two-way traffic amount | Secondary road one-way volume |
| 7:00-8:00 | 1325 | 676 |
| 8:00-9:00 | 1377 | 703 |
| 9:00-10:00 | 1476 | 710 |
| 10:00-11:00 | 1740 | 805 |
| 11:00-12:00 | 1462 | 695 |
| 12:00-13:00 | 1405 | 684 |
| 13:00-14:00 | 1379 | 665 |
| 14:00-15:00 | 1441 | 711 |
| 15:00-16:00 | 1460 | 722 |
| 16:00-17:00 | 1538 | 732 |
| 17:00-18:00 | 1633 | 793 |
| 18:00-19:00 | 1462 | 720 |
Summation process is carried out to one data of table and obtains the two-way total wheel traffic X of main roads in 12 hoursAlwaysFor 17698pcu,
Secondary road daily traffic volume YAlwaysFor 5900pcu.Step S2: wagon flow number of collisions and flow, accident number based on highway intersection
Relationship and traffic conflict seriousness theory obtain motor vehicle signal lamp installation warrants flow diagram, as shown in Figure 3.
Step S3: it is double that total traffic data average treatment of 12 hours obtained in step S1 is obtained into main roads
It is 1475pcu/h to mean hours volume of traffic X, the highest unidirectional mean hours volume of traffic Y of road is 492pcu/h, and will be two-dimentional
Coordinate points mark in Fig. 3, as a result refer to Fig. 6, it can be clearly seen that, the traffic flow magnitude coordinate points of the highway intersection are fallen in
Above curve, it is therefore proposed that motor vehicle signal lamp is arranged in the highway intersection.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (7)
1. determination method is arranged based on equivalent number of collisions highway intersection signal lamp in one kind, which comprises the following steps:
(1), the highway intersection of no signal lamp control is chosen as research object, distinguishes highway intersection according to motor vehicle flow
In main roads and secondary road, the motor vehicle flows of main roads is greater than secondary road, passes through field observation and obtains and sees
Survey the two-way traffic amount X that main roads are total in the timeAlwaysAnd secondary road daily traffic volume Y in observation timeAlways, hand over secondary road day
Flux YAlwaysBe in each unit hour in observation time in each secondary road the highest entrance driveway of one-way volume it is unidirectional
The summation of the volume of traffic；
(2), the motor vehicle flow based on highway intersection and wagon flow number of collisions, the relationship of accident number and traffic conflict seriousness are managed
By obtaining the rectangular coordinate system figure i.e. motor vehicle signal lamp installation warrants flow curve figure of main roads and secondary road；
(3), by the two-way traffic amount X of main roads in step (1)AlwaysAverage treatment, which is done, divided by observation time obtains highway intersection
Main roads hourly traffic volume X?；Secondary road daily traffic volume YAlwaysAverage treatment is done divided by observation time to obtain in per unit hour
The highest unidirectional mean hours volume of traffic Y of secondary road?, by highway intersection main roads hourly traffic volume X?And secondary road
Highest unidirectional mean hours volume of traffic Y?The two-dimensional coordinate point of composition is marked in motor vehicle signal lamp installation warrants flow curve
In figure, if the coordinate points are fallen in above curve, traffic lights are set in the highway intersection；Conversely, Bu Gai highway
Traffic lights are arranged in usual friendship mouth.
2. it is according to claim 1 a kind of based on equivalent number of collisions highway intersection signal lamp setting determination method, it is special
Sign is, step (2) the following steps are included:
(21) according to the relationship of the motor vehicle flow of highway intersection and wagon flow collision probability, the wagon flow punching of highway intersection is established
Prominent probability calculation model pijAre as follows:
Wherein, i=1,2,3,4 sequence indicate four entrance marks of highway intersection, j=1,2,3 sequence indicate turn left, straight trip and
Three kinds of vehicles of turning right flow to mark, such as ij indicates that i entrance j kind flows to vehicle, and mn indicates what vehicle corresponding with ij clashed
Vehicle mark is flowed to from m entrance n kind, away from λ is for vehicle in unit Min-conflicts away from interior average arrival when H is Min-conflicts
Rate (pcu/s)；
(22) it is based on traffic conflict seriousness conclusion, is obtained: intersection conflict: interflow conflict: shunting conflict=1:0.079:
0.079,
It can thus be concluded that all number of collisions are scaled equivalent intersection conflict number are as follows:
Wherein, TWhenFor all numbers of conflict at highway intersection in total equivalent traffic conflictcount, that is, unit hour, TIt hands over
For total all intersection conflict point numbers intersected in hour number of collisions, that is, unit hour at highway intersection, TPointFor total point
Flow all diverging conflicts numbers in traffic hour number of collisions, that is, unit hour at highway intersection, TIt closesIt is small for total interflow
When number of collisions, that is, unit hour in all interflow numbers of conflict at highway intersection.
3. it is according to claim 2 a kind of based on equivalent number of collisions highway intersection signal lamp setting determination method, it is special
Sign is, step (2) the following steps are included:
(23) it due to the collection excessive cycle of volume of traffic accident number, calculates for convenience, using the hair of traffic volume forecast accident number
Raw formula calculates the volume of traffic, generating polynomial are as follows:
Wherein, C is the critical traffic accident number of highway intersection, value 5, X in 1 yeardIt is main roads daily traffic volume (pcu/d)
Total two-way traffic amount of main roads, Y in i.e. 24 hoursdIt is secondary in secondary road daily traffic volume (pcu/d) i.e. 24 hours
Total two-way traffic amount of road, X are highway intersection main roads hourly traffic volumes (pcu/h), and Y is to hand over secondary road hour
Flux (pcu/h).
4. it is according to claim 3 a kind of based on equivalent number of collisions highway intersection signal lamp setting determination method, it is special
Sign is, step (2) the following steps are included:
(24) the total equivalent traffic conflictcount T calculated by comparison discovery using theoretical formula (2)WhenIt is arrived with field observation
Total the having differences property of number of collisions of highway intersection, in order to improve the accuracy of signal warrant, what is taken is other multiple
Highway intersection actual observation to total number of collisions and the obtained total equivalent traffic conflictcount of theoretical calculation carry out statistical
Analysis obtains the relational expression of the total equivalent traffic conflictcount and practical total number of collisions in theoretical calculation are as follows:
Wherein, V is vehicle flowrate total at highway intersection in highway intersection hour total flow, that is, unit hour, and unit is
(pcu/h)；
(25) when main roads hourly traffic volume X is 800, the highway of no signal lamp control is calculated using formula (2) (3) (4)
Total practical equivalent hour number of collisions T at usual friendship mouthIt is practical, relational expression is obtained with secondary road hourly traffic volume Y Fitting Analysis
Are as follows: Y=4 × 10-7-0.0004TIt is practical 2+0.5689TIt is practical+ 47.427, related coefficient 0.97；
When X using 100/h as step pitch when 500-1800, being incremented by, formula (2) (3) (4) is utilized to calculate the corresponding no letter of each X
Total practical equivalent hour number of collisions T at the highway intersection of signal lamp controlIt is practicalWith amounting to for secondary road hourly traffic volume Y
14 relation functions, by the peak value comparative studies to 14 relation functions, find the peak of curve of 14 relation functions between
Between 145-150, equivalent hour number of collisions T is determinedIt is practicalFor 145 times and it is defined as Critical Equivalent hour number of collisions TFace。
5. it is according to claim 4 a kind of based on equivalent number of collisions highway intersection signal lamp setting determination method, it is special
Sign is, step (2) the following steps are included:
(26) by Critical Equivalent hour number of collisions TFaceSubstitute into practical equivalent hour number of collisions T in step (2)It is practicalIt is small with secondary road
The relation function of hourly capacity Y is calculated main roads hourly traffic volume X and passs in 500-1800, using 100/h as step pitch
Secondary road critical traffic volume Y when increasingFace, utilize value and the corresponding secondary road of each main roads hourly traffic volume X
Critical traffic volume YFaceValue fitting building motor vehicle signal lamp installation warrants flow curve.
6. it is according to claim 2 a kind of based on equivalent number of collisions highway intersection signal lamp setting determination method, it is special
Sign is, in step (21),
Assuming that the arrival rate of two-phase conflict traffic A and wagon flow B existing for highway intersection obey Poisson distribution, it is assumed that highway usual friendship
Mouthful vehicle from stop line to conflict point between running time h enter away from H when being all equal to Min-conflicts and without vehicle tracking of banding together
Intersection, the then Probability p that wagon flow A and wagon flow B are clashed within hPunchingFor within this time two-phase conflict traffic vehicle arrive
The product of the probability of vehicle number >=1, it may be assumed that
pPunching=pa(k≥1)·pb(k≥1) (1-1)
Wherein, pPunchingThe probability clashed for wagon flow A and wagon flow B；
pa(k≥1)、pb(k >=1) is respectively wagon flow A, wagon flow the B interior probability for arriving vehicle number k >=1 between the h time；
Taking h value is 5 seconds, and the probability approximation of p (k > 1) is approximately equal to zero, and formula (1-1) can be write as:
pPunching=pa(k=1) pb(k=1) (1-2)
Poisson distribution is obeyed because vehicle reaches, therefore is had:
In the highway intersection of no signal lamp control, the probability that some wagon flow vehicle clashes within the △ t=h=H time is
The sum of the probability that it is clashed with each phase conflict traffic vehicle respectively obtains formula after arranging formula (1-3) are as follows:
7. it is according to claim 2 a kind of based on equivalent number of collisions highway intersection signal lamp setting determination method, it is special
Sign is, away from value 5s when H is Min-conflicts.
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