CN109035786A - A kind of traffic slot control method improving trunk roads Adjacent Intersections traffic efficiency - Google Patents

A kind of traffic slot control method improving trunk roads Adjacent Intersections traffic efficiency Download PDF

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Publication number
CN109035786A
CN109035786A CN201811177685.1A CN201811177685A CN109035786A CN 109035786 A CN109035786 A CN 109035786A CN 201811177685 A CN201811177685 A CN 201811177685A CN 109035786 A CN109035786 A CN 109035786A
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intersection
period
phase
vehicle
time
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李志斌
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Nanjing Ningyutong Traffic Technology Co Ltd
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Nanjing Ningyutong Traffic Technology Co Ltd
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/07—Controlling traffic signals
    • G08G1/081—Plural intersections under common control
    • G08G1/082—Controlling the time between beginning of the same phase of a cycle at adjacent intersections
    • 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
    • G08G1/0129—Traffic data processing for creating historical data or processing based on historical data
    • 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
    • G08G1/0137—Measuring and analyzing of parameters relative to traffic conditions for specific applications
    • G08G1/0145—Measuring and analyzing of parameters relative to traffic conditions for specific applications for active traffic flow control

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Traffic Control Systems (AREA)

Abstract

The invention discloses a kind of traffic slot control methods for improving trunk roads Adjacent Intersections traffic efficiency, include the following steps, on the basis of city thoroughfare transport need distributed intelligence, trunk roads transport need OD information in different time periods daily is obtained by multi-source data analysis technology, obtain the transport need amount for each entrance driveway of Adjacent Intersections that different periods trunk roads need to optimize, real-time vehicle arrival rate and vehicle queue length take the sum of all OD amounts of each entrance driveway all directions in intersection in a certain period for the transport need amount of this period direction.The present invention is by optimizing the control of each entrance driveway signal of Adjacent Intersections based on historical data traffic information, the appearance of Adjacent Intersections traffic capacity decline phenomenon can more efficiently be prevented, avoid the generation of traffic congestion, realize that intersection efficiency maximizes, its control method is easier to implement, and is with a wide range of applications and good application prospect.

Description

A kind of traffic slot control method improving trunk roads Adjacent Intersections traffic efficiency
Technical field
The present invention relates to traffic control and field of intelligent transportation technology more particularly to a kind of raising trunk roads Adjacent Intersections The traffic slot control method of traffic efficiency.
Background technique
Left turning vehicle and through vehicles, vehicle and pedestrian when signal lamp regulated crossing traffic lights control makes right line system It is staggered on transit time, is generally used for the intersection of the Urban Branch Road of heavy traffic and the intersection of arterial highway or arterial highway and arterial highway Place.Its intake section is widened in the intersection of signal lamp control, and the lane of import is separated by left-hand rotation, straight trip, right-hand rotation three-dimensional, increases Bus capacity can be significantly increased in number of track-lines.
It is mainly objective to undertake city based on communication function for the road of the city thoroughfare connection each major part traffic in city Freight transport task is the skeleton of urban road network, and carriageway width should be arranged according to magnitude of traffic flow size, it is linear answer it is straight therefore Trunk roads intersection is preferably as few as possible, and the traffic efficiency of city thoroughfare Adjacent Intersections directly affect trunk roads with it is each The traffic condition of crossroad, existing city thoroughfare Adjacent Intersections passage are mostly controlled using preset traffic lights, can not The phenomenon that preventing the decline of the Adjacent Intersections traffic capacity, is easy traffic congestion occur in certain periods, and it is logical to can not achieve intersection The maximization of line efficiency.
Summary of the invention
Technical problems based on background technology, the invention proposes a kind of current effects of raising trunk roads Adjacent Intersections The traffic slot control method of rate.
A kind of traffic slot control method improving trunk roads Adjacent Intersections traffic efficiency proposed by the present invention, including such as Lower step:
S1: it on the basis of city thoroughfare transport need distributed intelligence, is obtained by multi-source data analysis technology daily Trunk roads transport need OD information in different time periods obtains each import of Adjacent Intersections that different periods trunk roads need to optimize The transport need amount in road, real-time vehicle arrival rate and vehicle queue length take each entrance driveway all directions in intersection in a certain period All OD amounts sum for this period direction transport need amount；
S2: determining Adjacent Intersections signal control constraints condition, setting crossing inlet road all directions maximum queue length, Maximum, the minimum green time constraint of each phase, common period constraint, Capacity Constraints, Adjacent Intersections centre section are maximum Queue length and cycle duration constraint；
S3: determining different control times, when different daily according to each entrance driveway of historical traffic data acquisition acquired Control time can be divided into saturation period and unsaturation period by section vehicle arriving rate and vehicle queue length；
S4: the common signal period of two Adjacent Intersections of different periods is determined；The friendship got first according to each entrance driveway Through-flow data and constraint condition determine the cycle duration and signal timing dial of each integrative design intersection, determine two Adjacent Intersections In crucial intersection and non-key intersection, generally using in adjacent two intersection the signal period biggish intersection as key Intersection, and using the period of the intersection as the common period of two Adjacent Intersections coordinated controls；
S5: it for being saturated the period, using the vehicle queue length in section among Adjacent Intersections as control parameter, reasonably adjusts Phase difference and signal timing dial between Adjacent Intersections, according to the transport need amount obtained, the section among Adjacent Intersections When vehicle queue length reaches maximum queue length, using activated in advance green light, extend the strategies such as association phase green time, adjustment The signal timing dial of out of phase will form the vehicle of congestion in time between discharge Adjacent Intersections.
Preferably, in the S1, it is every that the trunk roads Adjacent Intersections to be optimized are obtained by multi-source data analysis technology Its different time sections transport need OD information, take all OD amounts of each entrance driveway all directions in intersection in a certain period and be this The transport need amount of the one period direction, and multi-source data analysis technology includes the modes such as video data, mobile phone signaling data.
Preferably, the S2 determines Adjacent Intersections signal control constraints condition, comprising the following steps:
S21: Adjacent Intersections signal control constraints condition is determined:
Entrance driveway queueing capacity constraint, to guarantee that the wagon flow of Adjacent Intersections all directions can operate normally, for adjacent Intersection all directions all set maximum queue length, i.e., the vehicle maximum queue length of traveling is waited in each entrance driveway of red time No more than queueing capacity；
Li< LI, max
Wherein, Li- intersection the direction i vehicle queue length
LI, max- intersection the direction i vehicle maximum queue length；
S22: the green time of green time constraint, all phases is constrained by minimum green time and maximum green time, And its maximum green time cannot be greater than among Adjacent Intersections after section association phase Green extension,
gi' < gI, max
gI, min< gi< gI, max
Wherein, giGreen time among '-Adjacent Intersections after section association phase Green extension
gi- intersection the direction i effective green time
gI, max- intersection the direction i maximum green time
gI, min- intersection the direction i minimum green time
To guarantee that all directions pedestrian can cross the street safely, for there is the phase green time of pedestrian's street crossing to cannot be less than minimum Green time, calculation formula are as follows:
gI, max=C-L- (k-1) gjmin(i=1,2 ... k；J=1,2 ..., i-1)
Wherein, LpPedestrian's street crossing lateral road length
vp- pedestrian's street crossing walking speed
I-green light time interval
Total losses time L-signal period；
S23: cycle duration constraint and common period constraint, cycle length should meet between minimum period and maximum cycle it Between constraint, common period constraint be two Adjacent Intersections signal period must be consistent, stipulated that common period upper limit value Cmax；
Cmin< C < Cmax
Wherein, C-cycle duration
Cmin- minimum period duration
Cmax- maximum cycle duration
It is very small that period from (120,150) this section starts the increasing degree that the traffic capacity became larger with the period, therefore week The upper limit, that is, maximum cycle duration that phase selects preferably is limited in (120,150) this section；
When integrative design intersection uses the minimum period, needs to meet the requirement of the traffic capacity, i.e., in one cycle, arrive Vehicle up to intersection has been cleared in one cycle just, both without vehicle is detained, also without extra signal period duration, most Minor cycle duration should be exactly equal in a cycle key signal phase green light loss temporal summation plus all arriving at vehicle with full Pass through the time required to intersection with flow rate, it may be assumed that
Wherein, total losses time L-signal period
yiThe flow-rate ratio in the-the i-th key signal phase key lane, i.e. the maximum stream flow ratio of the phase
The sum of the flow-rate ratio in all key signal phase keys of Y-lane
qijThe vehicle arriving rate of-the i-th key signal phase lane j
SijThe saturation volume rate of-the i-th key signal phase lane j
S24: traffic capacity equated constraint should ensure that exterior traffic flow in section is equal to the magnitude of traffic flow of leaving away in the period.
Preferably, in the S3, comprising the following steps: it is daily to obtain each entrance driveway according to the historical traffic data acquired Control time can be divided into saturation period and unsaturation period, if a certain by different periods vehicle arriving rate and vehicle queue length Entrance driveway vehicle arriving rate is greater than intersection capacity or vehicle queue length and is lined up greater than entrance driveway vehicle maximum in period Length, then the period is the saturation period；It otherwise, is the unsaturation period.
Preferably, in the S4, comprising the following steps: the traffic flow data got first according to each entrance driveway and constraint Condition determines the cycle duration and signal timing dial of each integrative design intersection, determines the crucial intersection in two Adjacent Intersections With non-key intersection, generally using signal period biggish intersection in adjacent two intersection as crucial intersection, and should Common period of the period of intersection as two Adjacent Intersections coordinated controls；
S41: determining the cycle duration of each integrative design intersection, and calculation formula is as follows:
Wherein, Ci- two Adjacent Intersections i signals control cycle duration
LPhaseNumber of phases in the-period
VeThe sum of-each phase key direction magnitude of traffic flow
PHF-peak hour factor
V/c-saturation volume rate；
S42: the common signal period of two Adjacent Intersections is determined, it is first determined crucial intersection and non-key intersection, Generally using signal period biggish intersection in adjacent two intersection as crucial intersection, and using the period of the intersection as The common period of two Adjacent Intersections coordinated controls, C1、C2The signal of respectively two Adjacent Intersections 1,2 controls cycle duration, then Common signal period C are as follows:
C=max { C1, C2}
S43: each phase effective green time in each intersection and practical green time, the week that will be acquired in S42 step are determined Phase duration subtracts total losses time in period, i.e. C-L, and the specific gravity that gained difference accounts for Ve further according to each phase key volume of traffic is divided Match, obtain the effective green time of each phase, the effective green time of each phase subtracts yellow time, in addition the loss of each phase Time is the practical green time of each phase；
S44: whether each intersection cycle time acquired in checking procedure S42, S43 after the completion of timing and green time Meet the constraint condition in S4 step, for being unsatisfactory for condition, calculated value is replaced using constraint condition value, when other phases Between, it is adjusted by equal proportion；
S45: determine that the phase difference between two Adjacent Intersections, phase difference can be by queue length, intersection spacing and vehicles Speed is determining, i.e. t=l/v, to reduce the waste of green time and the waste of road buffer to the maximum extent.
Preferably, it in the S5, for unsaturation section, is carried out using signal period obtained in S5 and signal timing dial Control；And for being saturated section, premised on the queuing vehicle in section among Adjacent Intersections is preferential, comprising the following steps:
S51: the vehicle queue length in section among Adjacent Intersections, and calculating side are obtained according to real-time traffic flow data Method is as follows:
All lanes are numbered according to established rule, and is located at No. i-th j-th of intersection of t- Δ t period lane and sails The vehicle number for entering section among two intersections is Iij(t), No. i-th intersection the is driven towards from section among two intersections in the period The vehicle number in j lane is Oij(t), i=1,2；J=1,2,3 ..., 11,12；
If Q12(t)、Q21(t) it respectively indicates intersection 1 after t moment and drives towards intersection 2 and intersection 2 and drive towards in intersection 1 Between section vehicle number, then t moment enters Q12(t) vehicle number Q12in(t) and Q is left12(t) vehicle number Q12out(t) respectively Are as follows:
Q12in(t)=I16(t)+k14I110(t)+k11I12(t)
Q12out(t)=O21(t)+O22(t)+O23(t)
Q12(t)=Q12(t-1)+Q12in(t)-Q12out(t)
T moment enters Q21(t) vehicle number Q21in(t) and Q is left21(t) vehicle number Q21out(t) it is respectively as follows:
Q21in(t)=I212(t)+k24I24(t)+k21I28(t)
Q12out(t)=O17(t)+O18(t)+O19(t)
Q21(t)=Q21(t-1)+Q21in(t)-Q21out(t)
Wherein,
I=1,2；J=1,2,3,4
S52: the maximum vehicle number that each direction in section can accommodate among two Adjacent Intersections is calculated, it is assumed that between intersection Away from L0, single standard car vehicle commander h, and single standard car vehicle commander includes safe spacing, unidirectional number of track-lines is n, then two The maximum vehicle number that each lane can accommodate in section among Adjacent Intersections is L0/h, unidirectionally can accommodate total vehicle number and be L0n/h；
S53: according to real-time traffic condition, phase long green light time is coordinated in adjustment, and section is a certain among two Adjacent Intersections When the vehicle queue length in lane reaches maximum queue length, using activated in advance green light, extend the plans such as association phase green time Slightly, the long green light time or phase sequence of phase are coordinated in adjustment, will form the vehicle of congestion between discharge Adjacent Intersections in time；
S54: extending the strategy of association phase green time, the last one detection moment before crucial phase green light terminates passes through It detects queue length on crucial phase entrance driveway and calculates current demand, crucial phase green extension is calculated according to transport need and is adjusted Whole current phase green time, then again extend green time terminate before the last one detection moment, pass through detection queue length Transport need is calculated, and accordingly extends green time, until reaching the maximum green time being mutually arranged terminates, if green after extending The lamp time is greater than maximum green time, then replaces the phase green time calculated value with maximum green time, and terminate the phase green light, If detecting entrance driveway without vehicle queue, directly terminate the phase green light；
S55: activated in advance green light strategy, the vehicle queue feelings based on each entrance driveway of two Adjacent Intersections of video real-time detection Condition judges whether vehicle queue length is more than maximum queuing on each entrance driveway in intermediate section when intermediate section association is mutually red light Length, if it exceeds maximum queue length, then when other mutually meet the constraint condition of minimum long green light time and terminate in advance green light When the vehicle queue length of the current phase of signal is less than its maximum queue length, the current red signal period is terminated in advance, is mentioned Section is associated with phase green light signals among preceding activation；If judging that finish time is still lined up without intermediate section association phase overlength Occur, then maintains original signal timing scheme.
The invention has the benefit that by being based on historical data traffic information to each entrance driveway signal control of Adjacent Intersections System optimizes, and can more efficiently prevent the appearance of Adjacent Intersections traffic capacity decline phenomenon, avoid traffic congestion It generates, realizes that intersection efficiency maximizes, control method is easier to implement, is with a wide range of applications and answers with good Use prospect.
Detailed description of the invention
Fig. 1 is a kind of traffic slot control method for improving trunk roads Adjacent Intersections traffic efficiency proposed by the present invention Schematic diagram is arranged in two Adjacent Intersections hardware support kits.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.
Referring to Fig.1, a kind of traffic slot control method improving trunk roads Adjacent Intersections traffic efficiency, including following step It is rapid:
Data collection: it on the basis of city thoroughfare transport need distributed intelligence, is obtained by multi-source data analysis technology Daily trunk roads transport need OD information in different time periods is taken, the Adjacent Intersections that different periods trunk roads need to optimize are obtained The transport need amount of each entrance driveway, real-time vehicle arrival rate and vehicle queue length take each entrance driveway in intersection in a certain period The sum of all OD amounts of all directions for this period direction transport need amount.
Determine Adjacent Intersections signal control constraints condition: setting crossing inlet road all directions maximum queue length, each Maximum, the minimum green time constraint of phase, common period constraint, Capacity Constraints, Adjacent Intersections centre section maximum row Team leader's degree and cycle duration constraint.
It determines different control times: each daily different periods vehicle of entrance driveway is obtained according to the historical traffic data acquired Control time can be divided into saturation period and unsaturation period by arrival rate and vehicle queue length.
Determine the common signal period of two Adjacent Intersections of different periods: the traffic flow got first according to each entrance driveway Data and constraint condition determine the cycle duration and signal timing dial of each integrative design intersection, determine in two Adjacent Intersections Crucial intersection and non-key intersection generally intersect using signal period biggish intersection in adjacent two intersection as key Mouthful, and using the period of the intersection as the common period of two Adjacent Intersections coordinated controls.
For being saturated the period: using the vehicle queue length in section among Adjacent Intersections as control parameter, reasonably adjusting phase Phase difference and signal timing dial between adjacent intersection, according to the transport need amount obtained, the section vehicle among Adjacent Intersections When queue length reaches maximum queue length, using activated in advance green light, extend the strategies such as association phase green time, adjustment is not The signal timing dial of same-phase will form the vehicle of congestion in time between discharge Adjacent Intersections.
In the present invention, firstly, the historical traffic data by acquisition obtains each entrance driveway real-time vehicle arrival rate and vehicle Queue length was divided into several control times for one day, was then the optimal control parameter of each choosing period of time, using difference Signal timing dial, judge whether each entrance driveway traffic flow running rate of each period crossover mouth supersaturated, according to transport need amount Adjust the signal timing plan of each entrance driveway, each entrance driveway vehicle percent of pass of coordinated control, when occur transport need amount be greater than it is logical When row ability, using activated in advance green light, extends the strategies such as association phase green time, optimization is up to intersection capacity Target will form the vehicle of congestion in time, pour in intermediate road to avoid intersection all directions vehicle between discharge Adjacent Intersections Section leads to the generation of traffic congestion, and traffic capacity decline phenomenon is avoided to occur and maintain intersection capacity；Based on history number According to traffic slot control algolithm can carry out intersection optimal control for daily peak period, promote Adjacent Intersections control The reaction speed and control effect of system.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto, Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.

Claims (6)

1. a kind of traffic slot control method for improving trunk roads Adjacent Intersections traffic efficiency, which is characterized in that including as follows Step:
S1: it on the basis of city thoroughfare transport need distributed intelligence, is obtained by multi-source data analysis technology different daily The trunk roads transport need OD information of period obtains each entrance driveway of Adjacent Intersections that different periods trunk roads need to optimize Transport need amount, real-time vehicle arrival rate and vehicle queue length take the institute of each entrance driveway all directions in intersection in a certain period There is the sum of OD amount for the transport need amount of this period direction；
S2: determining Adjacent Intersections signal control constraints condition, sets crossing inlet road all directions maximum queue length, each phase Maximum, the minimum green time constraint in position, common period constraint, Capacity Constraints, Adjacent Intersections centre section maximum are lined up Length and cycle duration constraint；
S3: determining different control times, obtains each daily different periods vehicle of entrance driveway according to the historical traffic data acquired Control time can be divided into saturation period and unsaturation period by arrival rate and vehicle queue length；
S4: the common signal period of two Adjacent Intersections of different periods is determined；The traffic flow got first according to each entrance driveway Data and constraint condition determine the cycle duration and signal timing dial of each integrative design intersection, determine in two Adjacent Intersections Crucial intersection and non-key intersection generally intersect using signal period biggish intersection in adjacent two intersection as key Mouthful, and using the period of the intersection as the common period of two Adjacent Intersections coordinated controls；
S5: it for being saturated the period, using the vehicle queue length in section among Adjacent Intersections as control parameter, reasonably adjusts adjacent Phase difference and signal timing dial between intersection, according to the transport need amount obtained, the section vehicle among Adjacent Intersections When queue length reaches maximum queue length, using activated in advance green light, extend the strategies such as association phase green time, adjustment is different The signal timing dial of phase will form the vehicle of congestion in time between discharge Adjacent Intersections.
2. a kind of traffic slot control method for improving trunk roads Adjacent Intersections traffic efficiency according to claim 1, It is characterized in that, obtaining the trunk roads Adjacent Intersections to be optimized daily not by multi-source data analysis technology in the S1 With period transport need OD information, take all OD amounts of each entrance driveway all directions in intersection in a certain period and when for this The transport need amount of the section direction, and multi-source data analysis technology includes the modes such as video data, mobile phone signaling data.
3. a kind of traffic slot control method for improving trunk roads Adjacent Intersections traffic efficiency according to claim 1, It is characterized in that, the S2 determines Adjacent Intersections signal control constraints condition, comprising the following steps:
S21: Adjacent Intersections signal control constraints condition is determined:
Entrance driveway queueing capacity constraint, to guarantee that the wagon flow of Adjacent Intersections all directions can operate normally, for adjacent intersection Mouth all directions all set maximum queue length, i.e., wait the vehicle maximum queue length of traveling not surpass in each entrance driveway of red time Cross queueing capacity；
Li< LI, max
Wherein, Li- intersection the direction i vehicle queue length
LI, max- intersection the direction i vehicle maximum queue length；
S22: the green time of green time constraint, all phases is constrained by minimum green time and maximum green time, and phase Its maximum green time cannot be greater than among adjacent intersection after section association phase Green extension,
gi' < gI, max
gI, min< gi< gI, max
Wherein, giGreen time among '-Adjacent Intersections after section association phase Green extension
gi- intersection the direction i effective green time
gI, max- intersection the direction i maximum green time
gI, min- intersection the direction i minimum green time
To guarantee that all directions pedestrian can cross the street safely, for there is the phase green time of pedestrian's street crossing to cannot be less than minimum green light Time, calculation formula are as follows:
gI, max=C-L- (k-1) gjmin(i=1,2 ... k；J=1,2 ..., i-1)
Wherein, Lp- pedestrian's street crossing lateral road length
vp- pedestrian's street crossing walking speed
I-green light time interval
Total losses time L-signal period；
S23: cycle duration constraint and common period constraint, cycle length should meet between minimum period and maximum cycle Constraint, common period constraint is that the signal period of two Adjacent Intersections must be consistent, stipulated that common period upper limit value Cmax；
Cmin< C < Cmax
Wherein, C-cycle duration
Cmin- minimum period duration
Cmax- maximum cycle duration
It is very small that period from (120,150) this section starts the increasing degree that the traffic capacity became larger with the period, therefore the period is selected The upper limit, that is, maximum cycle duration is preferably limited in (120,150) this section；
It when integrative design intersection uses the minimum period, needs to meet the requirement of the traffic capacity, i.e., in one cycle, reaches and hand over The vehicle of prong has been cleared in one cycle just, both without vehicle is detained, also without extra signal period duration, most Xiao Zhou Phase duration should be exactly equal in a cycle key signal phase green light loss temporal summation plus all arriving at vehicle with saturated flow Rate passes through the time required to intersection, it may be assumed that
Wherein, the total losses time of L- signal period
yiThe flow-rate ratio in the-the i-th key signal phase key lane, i.e. the maximum stream flow ratio of the phase
The sum of the flow-rate ratio in all key signal phase keys of Y- lane
qijThe vehicle arriving rate of-the i-th key signal phase lane j
SijThe saturation volume rate of-the i-th key signal phase lane j
S24: traffic capacity equated constraint should ensure that exterior traffic flow in section is equal to the magnitude of traffic flow of leaving away in the period.
4. a kind of traffic slot control method for improving trunk roads Adjacent Intersections traffic efficiency according to claim 1, It is characterized in that, in the S3, comprising the following steps: it is different daily to obtain each entrance driveway according to the historical traffic data acquired Control time can be divided into saturation period and unsaturation period, if a certain period by period vehicle arriving rate and vehicle queue length Interior entrance driveway vehicle arriving rate is greater than intersection capacity or vehicle queue length is greater than entrance driveway vehicle maximum queue length, Then the period is the saturation period；It otherwise, is the unsaturation period.
5. a kind of traffic slot control method for improving trunk roads Adjacent Intersections traffic efficiency according to claim 1, It is characterized in that, in the S4, comprising the following steps: the traffic flow data and constraint item got first according to each entrance driveway Part determines the cycle duration and signal timing dial of each integrative design intersection, determine crucial intersection in two Adjacent Intersections and Non-key intersection, generally using signal period biggish intersection in adjacent two intersection as crucial intersection, and by the friendship Common period of the period of prong as two Adjacent Intersections coordinated controls；
S41: determining the cycle duration of each integrative design intersection, and calculation formula is as follows:
Wherein, Ci- two Adjacent Intersections i signals control cycle duration
LPhaseNumber of phases in the-period
VeThe sum of-each phase key direction magnitude of traffic flow
PHF-peak hour factor
V/c-saturation volume rate；
S42: the common signal period of two Adjacent Intersections is determined, it is first determined crucial intersection and non-key intersection, generally Using signal period biggish intersection in adjacent two intersection as crucial intersection, and using the period of the intersection as two-phase The common period of adjacent intersection coordinated control, C1、C2The signal of respectively two Adjacent Intersections 1,2 controls cycle duration, then public Signal period C are as follows:
C=max { C1, C2}
S43: determining each phase effective green time in each intersection and practical green time, when the period that will be acquired in S42 step Length subtracts total losses time in period, i.e. C-L, and the specific gravity that gained difference accounts for Ve further according to each phase key volume of traffic is allocated, The effective green time of each phase is obtained, the effective green time of each phase subtracts yellow time, in addition when the loss of each phase Between be each phase practical green time；
S44: whether each intersection cycle time and green time acquired in checking procedure S42, S43 after the completion of timing meet Constraint condition in S4 step replaces calculated value using constraint condition value, other phase times are pressed for being unsatisfactory for condition Equal proportion is adjusted；
S45: determine that the phase difference between two Adjacent Intersections, phase difference can be true by queue length, intersection spacing and speed It is fixed, i.e. t=l/v, to reduce the waste of green time and the waste of road buffer to the maximum extent.
6. a kind of traffic slot control method for improving trunk roads Adjacent Intersections traffic efficiency according to claim 1, It is characterized in that, for unsaturation section, being controlled using the signal period and signal timing dial obtained in S5 in the S5 System；And for being saturated section, premised on the queuing vehicle in section among Adjacent Intersections is preferential, comprising the following steps:
S51: the vehicle queue length in section among Adjacent Intersections is obtained according to real-time traffic flow data, and calculation method is such as Under:
All lanes are numbered according to established rule, and is located at No. i-th j-th of intersection of t- Δ t period lane and drives into two The vehicle number in section is I among intersectionij(t), No. i-th intersection is driven towards j-th from section among two intersections in the period The vehicle number in lane is Oij(t), i=1,2；J=1,2,3 ..., 11,12；
If Q12(t)、Q21(t) it respectively indicates intersection 1 after t moment and drives towards intersection 2 and intersection 2 and drive towards the intermediate road in intersection 1 Section vehicle number, then t moment enters Q12(t) vehicle number Q12in(t) and Q is left12(t) vehicle number Q12out(t) it is respectively as follows:
Q12in(t)=I16(t)+k14I110(t)+k11I12(t)
Q12out(t)=O21(t)+O22(t)+O23(t)
Q12(t)=Q12(t-1)+Q12in(t)-Q12out(t)
T moment enters Q21(t) vehicle number Q21in(t) and Q is left21(t) vehicle number Q21out(t) it is respectively as follows:
Q21in(t)=I212(t)+k24I24(t)+k21I28(t)
Q12out(t)=O17(t)+O18(t)+O19(t)
Q21(t)=Q21(t-1)+Q21in(t)-Q21out(t)
Wherein,
S52: the maximum vehicle number that each direction in section can accommodate among two Adjacent Intersections is calculated, it is assumed that intersection spacing L0, Single standard car vehicle commander h, and single standard car vehicle commander includes safe spacing, unidirectional number of track-lines is n, then two adjacent friendship The maximum vehicle number that each lane can accommodate in section among prong is L0/h, and can unidirectionally accommodate total vehicle number is L0n/h；
S53: according to real-time traffic condition, phase long green light time is coordinated in adjustment, a certain lane in section among two Adjacent Intersections Vehicle queue length when reaching maximum queue length, using activated in advance green light, extend the strategies such as association phase green time, adjust The whole long green light time or phase sequence for coordinating phase will form the vehicle of congestion in time between discharge Adjacent Intersections；
S54: extending the strategy of association phase green time, the last one detection moment before crucial phase green light terminates passes through detection Queue length calculates current demand on crucial phase entrance driveway, calculates crucial phase green extension according to transport need and adjusts and works as Preceding phase green time, then again extend green time terminate before the last one detection moment, pass through detection queue length calculate Transport need, and accordingly extend green time, until reaching the maximum green time being mutually arranged terminates, if after extending when green light Between be greater than maximum green time, then replace the phase green time calculated value with maximum green time, and terminate the phase green light, if Entrance driveway is detected without vehicle queue, then directly terminates the phase green light；
S55: activated in advance green light strategy, based on the vehicle queue situation of each entrance driveway of two Adjacent Intersections of video real-time detection, When intermediate section association is mutually red light, judge whether vehicle queue length is more than maximum length of queue on each entrance driveway in intermediate section Degree, if it exceeds maximum queue length, then when other mutually meet the constraint condition of minimum long green light time and terminate in advance green light letter Number current phase vehicle queue length be less than its maximum queue length when, terminate in advance the current red signal period, in advance Intermediate section is activated to be associated with phase green light signals；If judging that finish time is still lined up out without intermediate section association phase overlength It is existing, then maintain original signal timing scheme.
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