CN107705592A - Towards the coordinating control of traffic signals optimization method of emergency relief vehicle driving path - Google Patents
Towards the coordinating control of traffic signals optimization method of emergency relief vehicle driving path Download PDFInfo
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Abstract
The present invention relates to a kind of coordinating control of traffic signals optimization method towards emergency relief vehicle driving path, including the division of emergency relief priority level, path type division, signal priority control, signal coordinated control, Bi-level Programming Models, related coordination is carried out as research object using path and controls research；First, emergency relief feature and target analysis are carried out；And then based on Bi-level Programming Models, study the dynamic phasing difference on upper strata under different path forms and the path green wave coordination of lower floor；Finally, the simulation case analysis and checking of correlation are carried out.The method of the present invention has real-time, intersection time and the real-time on-vehicle information of public vehicles are reached using emergency relief, the traffic signals that path is carried out to emergency relief coordinate priority acccess control, can improve the emergency relief response time, effectively reduce casualties and property loss.
Description
Technical field
It is more particularly to a kind of towards Emergency Rescue Vehicle the present invention relates to a kind of Traffic Signals in Urban Roads method for controlling priority
The coordinating control of traffic signals dual layer resist optimization method of driving path.
Background technology
Expanding economy, urbanization process are accelerated, and inner city traffic circulation state is continuous worsening, traffic safety, traffic
Block and traffic pollution it is increasingly serious, urban traffic control concern emphasis will gradually from maximum probability but the extent of injury it is relative
Relatively low congestion event, to small probability but the high burst fire-disaster event strategic shift of grade malignancy.
The particularly urban road constantly high concentration of expansion and urban land causes city larger disaster-stricken hidden danger to be present,
Once burst fire-disaster event occurs, it cannot such as evacuate and timely rescue and will cause huge casualties and property loss.
Emergency relief vehicle, refer to ambulance, fire fighting truck, police car on duty, municipal breakdown van (electric power, water supply, traffic), work
The vehicle of special emergency rescue task is carrying out in the cities such as journey wrecking truck.In actual life, these vehicles are because to along the line
Traffic, which lacks, effectively to be understood and grasped, and can not adjust vehicle line, conventional traffic information gathers in addition maneuverability
The limitations of mode, along the line intersection signal priority acccess control strategy it can not be timely responded to, be usually submerged in it and gather around
It is in a dilemma in traffic congestion stream, the emergency relief time of preciousness is consumed for no reason, is further exacerbated by the loss of manpower and materials.
Correlative study shows, after natural or artificial vital emergent event occurs, the severely injured personnel of the same condition of the injury, at 30 minutes
Inside it is rescued, its survival rate is 80%, is rescued in 60 minutes and 90 minutes, and its survival rate is only 40% and 10%, therefore, city respectively
It is self-evident for the importance of emergency relief traffic control in city's traffic, after the incident need to be to reduce Loss of Life and property
Timely Dynamic Programming goes out one " gold lifeline " between rescue facility and the site of an accident, and along the line to breakdown lorry carry out and
When respond, rational traffic control strategy is set, makes it as current without delay as possible, shortens journey time.Particularly traffic is asked
Increasingly serious big city is inscribed, next traffic safety, traffic jam issue are more prominent with emergency relief traffic process, first
In the urban traffic control and control system entered, the emergency relief traffic control of function in-depth has great demand.
In terms of research preferential to emergency relief at present concentrates on Path selection, a gold rescue route is found, it is right
Research is less in terms of emergency relief signal timing and optimization.But spatially preferential does not ensure that emergency relief vehicle is quick
Reach accident spot, it is therefore desirable to which separation promptly rescues wagon flow and social wagon flow from the time.It is excellent to the signal of emergency relief vehicle
First control research mainly sets detector, and system can not be set according to the type of vehicle and flow predicted to optimize signal,
Such as change the duration of each phase or using the cycle time and phase sequence being more suitable for, and traffic once occurs for intersection
Congestion, vehicle queue phenomenon is produced, if breakdown lorry arrival intersection adjusts signal and shown again, the queuing vehicle of intersection can
It can not can in time dissipate, its priority pass can be influenceed, improved space in a conventional method be present；It is concentrated mainly on single direction
The signal priority control of single emergency relief vehicle, reach the leggy of intersection simultaneously to multi-direction more emergency relief vehicles
Coordinate the less of priority acccess control research；It is for studying the shortcomings that single intersection signal is preferential, in stationary phase phase sequence bar
Under part, red time is only shortened by algorithm or extends green time to adjust original signal timing parameter, can be interrupted original
Signal timing dial, and in this mode, emergency relief vehicle is larger by the amount of calculation of resuming work behind intersection.
On the other hand, the dual layer resist mould of signal priority has been carried out for Actual path with reference to the characteristics of emergency relief traffic
Type research, meet the preferential actual conditions of emergency relief signal, because actual rescue is not necessarily the signal of single crossing
Preferentially, but the signal coordinating of set optimal path is preferential.First, emergency relief feature and target analysis are carried out；And then it is based on
Bi-level Programming Models, study the dynamic phasing difference on upper strata under different path forms and the path green wave coordination of lower floor；Finally, carry out
Related simulation case analysis and checking.
Therefore, those skilled in the art is directed to developing a kind of traffic signals towards emergency relief vehicle driving path
Coordinate control dual layer resist optimization method.
The content of the invention
Harmfulness and existing research for present Urban Emergency control for the emergency relief signal of path-level
Strategy study is less, it is difficult to which the solution emergency relief vehicle response process of emergency system of system, the present invention propose a kind of towards urgent
The coordinating control of traffic signals optimization method of breakdown lorry driving path；This method uses upper strata poor for emergency relief dynamic phasing
Model, lower floor are the green wave pattern in emergency relief path；The queue length in front of dynamic phasing difference aspect, foundation emergency relief fleet
The estimated time is reached with emergency relief, the dynamic phasing for calculating each intersection relative to previous intersection is poor；In emergency relief
The green ripple aspect in path, the solution of losing according to route turning feature and handling capacity turn to bandwidth and formed pair with straight trip bandwidth
Than solving maximum bandwidth using genetic algorithm；No priority acccess control strategy, Single Intersection preference strategy is respectively adopted, path is coordinated
Dual layer resist strategy is controlled to carry out VISSIM microscopic simulation experiments.
The technical scheme is that：A kind of coordinating control of traffic signals towards emergency relief vehicle driving path optimizes
Method, including the division of emergency relief priority level, path type division, signal priority control, signal coordinated control, dual layer resist
Model, related coordination is carried out as research object using path and controls research；First, emergency relief feature and target analysis are carried out；
And then based on Bi-level Programming Models, study the dynamic phasing difference on upper strata under different path forms and the path green wave coordination of lower floor；
Finally, the simulation case analysis and checking of correlation are carried out.
The emergency relief priority level division：According to emergency relief feature to the other emergency relief vehicle of different priorities
Carry out classify.Consider the factors such as emergency relief vehicle type, intersection signal timing, category of roads, Fleet size, really
Its fixed degree of priority, priority level highest are ambulance, natural calamity wrecking truck, fire fighting truck, are secondly police car, engineering
Wrecking truck, traffic accident tractor, it is finally evacuating personnel car, emergency relief goods and materials car.
Described path type division：To the fundamental type and combining form of outbound path, wherein fundamental type includes straight trip
Path, straight trip left-hand rotation path, straight trip right-hand rotation path, combining form include stepped path and U-shaped path.
The signal priority control：According to current phase green time and emergency relief arrival time, green light is taken in decision
Light in advance or green light extends.
It is described to coordinate control：The green wave pattern in whole piece path is established, whole path signal is carried out a signal coordinating control
System.
The Bi-level Programming Models：It is green to study the dynamic phasing differential mode type on upper strata and the path of lower floor under different path forms
Ripple is coordinated；In dynamic phasing difference aspect, estimated time, meter are reached according to queue length in front of emergency relief fleet and emergency relief
The dynamic phasing that each intersection is calculated relative to previous intersection is poor；In the green ripple aspect in emergency relief path, foundation route turning
The solution of losing of feature and handling capacity turns to bandwidth and is contrasted with straight trip bandwidth, and maximum belt is solved using genetic algorithm
It is wide.
The simulation case analysis and checking：Dual layer resist traffic signals are assisted with traffic simulation software VISSIM
Control strategy, Single Intersection signal priority strategy and no signal preference strategy is adjusted to carry out simulation analysis, control plan is coordinated in contrast
Omit, the average traffic delay queue length of emergency relief vehicle, stroke under Single Intersection signal priority strategy and no signal preference strategy
Time, stop frequency and intersection total delay.
The beneficial effects of the present invention are：The inventive method takes into full account emergency relief in response process is actually rescued
Signal timing dial problem, it is proposed that the path signal towards emergency relief coordinates control dual layer resist optimization method, clearly each to intersect
The corresponding traffic control scheme used of mouth, accurately handles the queuing vehicle of each intersection, makes emergency relief vehicle is not parking to pass through
Whole path, rescue response efficiency is improved, reduces casualties and property loss.Simulation result shows, takes path to coordinate control
Dual layer resist strategy processed can make emergency relief delay reduce 35% relative to no signal preference strategy, and journey time reduces 18%,
Queue length reduces 36%, and stop frequency reduces 38%, and whole path public vehicles is influenceed minimum.The present invention has efficient
Property, reliability, practicality.
Brief description of the drawings
The path signal towards emergency relief that Fig. 1 is the present invention coordinates control optimization method global optimization flow chart；
Fig. 2 is the route turning type schematic diagram of the present invention；
Schematic diagram is evacuated in the queuing that Fig. 3 is the present invention；
Fig. 4 is the emergency relief traffic dynamic offset model figure of the present invention；
Fig. 5 is the green ripple control figure of emergency relief traffic route of the present invention；
Fig. 6 is the signal time distributing conception figure of the present invention.
Embodiment
Below with reference to accompanying drawing, technical scheme, concrete structure and control method are illustrated.
As shown in figure 1, a kind of path signal towards emergency relief coordinates control dual layer resist optimization method, using urgent
Rescue feature carries out priority level division, and is disappeared according to traffic signals real-time status, and emergency relief arrival time and queuing
The relation of time is dissipated, determines the signal priority strategy of the intersection, is that green light extends or green light lights in advance.Then according to green
The change of lamp time redefines the phase difference of each intersection, and then redefines the bound of bandwidth.Such as by emulating
To ineffective, phase difference and bandwidth are readjusted, until being optimal solution, meets emergency relief vehicle delay minimum, stroke
Time is most short.
Fig. 2 is the route turning type schematic diagram of the present invention, and its cathetus represents straight trip path, and left-hand rotation arrow represents left
Turn, right-hand rotation arrow represents to turn right.Path is divided into three types：Fundamental type, U-shaped and stairstepping.Wherein fundamental type includes straight
Line style path and straight trip are turned left, straight trip three kinds of citation forms of right-hand rotation；It is U-shaped including straight trip, turn left, turn left and straight trip, turn right, turn right
Two kinds of citation forms；Stairstepping path is including straight trip, left-hand rotation, right-hand rotation and straight trip, right-hand rotation, turn left two kinds of citation forms, complicated
Path is all developed by this several elementary path substantially.
Fig. 3 be the present invention queuing evacuate schematic diagram, emergency relief vehicle apart from front queuing vehicle have a safety away from
From if current green time allows emergency relief vehicle not slow down by intersection enough, without changing signal time distributing conception；
If it is a part of that current green time can only allow queuing vehicle to dissipate, need to extend green time, Fig. 3, which gives, promptly to be rescued
Vehicle and front queuing vehicle are helped in the traveling of intersection and evacuation schematic diagram.
Fig. 4 be the present invention emergency relief traffic dynamic offset model figure, it is ensured that emergency relief vehicle it is not parking according to
It is secondary by intersection along the line, then front is without queuing vehicle when needing to ensure to reach each intersection, and signal timing dial is in green light
In.Therefore, queuing vehicle resolution time in front of each intersection is calculated based on real-time queue length, and with emergency relief vehicle
Reaching the intersection time compares, and with reference to current multiphase traffic time allocation, is such as unsatisfactory for emergency relief and blocks by nothing by the way that then adjustment is tight
Phase signal timing where first aid is helped, untill meeting that emergency relief vehicle blocks by nothing by along thread path.
A. the situation when emergency relief by intersection n-1 for green light
(1) when emergency relief vehicle is from intersection n-1 to intersection n journey timeMore than intersection n-1 with handing over
The queue clearance time between prong nWhen, it is necessary to which green light is delayed, green light delay time is：
In formula：For intersection n green light delay time,It is emergency relief vehicle from intersection n-1 to intersection
Mouth n journey time,For intersection n remaining green time, tsFor the personal distance time.Green light delay does not change green light and risen
Begin the moment, a change green light finish time, therefore phase difference of the situation of green light delay using green last time difference as two intersections.
The intersection n green last moment is：
In formula：For the intersection n green last moment,The green light of scheme during the green last moment, i.e. first wife initial for intersection n
Finish time,ts,Implication is same as above.
The intersection n-1 green last moment is：
In formula：For the intersection n-1 green last moment,For the intersection n-1 initial green last moment,Promptly to rescue
Vehicle is helped from intersection n-2 to intersection n-1 journey time,For intersection n-1 remaining green time, tsImplication is same
On.
Intersection n-1 and intersection n phase difference is：
In formula：t(n-1,n)For the phase difference between intersection n-1 and n,Implication is same as above, and p is priority level, Δ t
For the safe buffering time, the calculating of Adjacent Intersections dynamic phasing difference can combine emergency relief priority level feature, high preferential
The needs of class requirement switch phase in time, priority level it is relatively low can have a safe buffering time.
(2) when emergency relief vehicle is less than intersection n-1 and intersection n from intersection n-1 to intersection n journey time
Between the queue clearance time, i.e.,When, it is necessary to which green light opens bright in advance, green light opens the bright time and is in advance,
In formula：Open the bright time in advance for green light,The queue clearance time between intersection n-1 and intersection n,
Other parameters implication is as above.Green light open in advance it is bright change green light initial time, therefore green light open in advance bright situation with it is green at the beginning
Carve phase difference of the difference as two intersections.
Intersection n green lights, which light, is constantly：
In formula：The moment is lighted for intersection n green lights,Lighted the moment for the initial green lights of intersection n, i.e. first wife when side
The green light start time of case, other parameters implication is as above.
Intersection n-1 green lights, which light, is constantly：
In formula：The moment is lighted for intersection n-1 green lights,Lighted the moment for the initial green lights of intersection n-1, Qi Tacan
Number implication is as above.
Intersection n and intersection n-1 phase difference is：
B. the situation when emergency relief by intersection n-1 for red light
(1) when emergency relief vehicle is more than intersection n-1 and intersection n from intersection n-1 to intersection n journey time
Between the queue clearance time, i.e.,When, it is necessary to which green light opens bright in advance, green light opens the bright time and is in advance,
In formula：The bright time is opened in advance for intersection n,For intersection n remaining red time, other specification contains
Justice is same as above.
Intersection n green lights, which light, is constantly：
Intersection n-1 green lights, which light, is constantly：
Intersection n and intersection n-1 phase difference is：
(2) when emergency relief vehicle is less than intersection n-1 and intersection n from intersection n-1 to intersection n journey time
Between the queue clearance time, i.e.,When, it is necessary to which green light opens bright in advance, green light opens the bright time and is in advance,
In formula：The bright time is opened in advance for intersection n green light, and other each meaning of parameters are same as above.
N-th of intersection green light lights and is constantly：
(n-1)th intersection green light lights and is constantly：
The phase difference of n-th and n-1 intersection is：
Fig. 5 is the green ripple control figure of emergency relief traffic route of the present invention, and the green wave pattern of emergency relief traffic route includes
The green wave pattern of straight line path and the green wave pattern of turning path, the green wave pattern of straight line path include common period, split, phase difference
Optimization, calculate coordinate phase green wave band bound；For turning path on the basis of straight line path bandwidth, foundation is diverted through energy
The difference of power, solve and turn to bandwidth, finally solve weight path total bandwidth.
If coordination phase maximum in a cycle can light green time in advance and beMaximum can postpone green time
ForWhen emergency relief phase need green light extend or it is early open when, can in this cycle other non-coordinating phase-compressions to full
Green time more than needed and next cycle green time are used to extend the time needed for emergency relief when with degree being 0.9.
1) maximum delay opens green time model with early
A. maximum delay green time model
According to aforementioned claim, green light delay timeIt is less than maximum delay green time
The maximum green time that can be delayed is：
In formula：For the compressible green time sum of other phases of the cycles of intersection n n-th,For (n+1)th week
Phase can provide green time sum.
B. green time model is most opened very early in the morning
According to aforementioned claim, green light opens the bright time in advanceIt is less than and most opens green time very early in the morning
Maximum can early open green time：
In formula：For the compressible green time of phase before i phases in the cycles of intersection n n-th.
2) the wide upper-lower limit of green wave band
Define the wide initial value w of green wave band0Not consider the bandwidth of emergency relief vehicle, i.e., no Phase-switching it is initial green
Wavestrip width.Therefore, after introducing emergency relief phase is preferential, different intersections are according to real-time queue length and phase green time
Relation, determine to extend or early open coordinate phase (phase where emergency relief vehicle) green time, cause initial bandwidth quilt
Destroy, therefore, it is necessary to seek the wide bound of emergency relief green wave band, it is wide to redefine path green wave band, determines that the n-th cycle is urgent
The rescue coordination phase green time midpoint moment is to determine the wide bound of green wave band.
The phase green time midpoint moment is coordinated in the emergency relief of n-th cycle：
In formula：Coordinate the phase green wave band midpoint moment for the emergency relief of the n-th cycle,It is non-coordinating for the n-th cycle
Phase green time,Coordinate phase green time for the emergency relief of the n-th cycle, C is common period length, and parameter takes in formula
Value is shown below：
In formula：For non-coordinating phase initial green light time,To coordinate phase initial green light time, the green ripple of emergency relief
Belt restraining lower limit：Emergency relief green wave band constrains the upper limit：
Coordinate green wave band minimum bandwidth：
Coordinate green wave band maximum bandwidth：
In formula：w0For initial green wave band width, wminTo coordinate green wave band minimum widith, wmaxTo coordinate green wave band maximum belt
It is wide.
3) the green wave pattern of emergency relief traffic turning path：
In view of the design of daily signal lamp phase phase sequence, main line section is typically by straight trip signal, left rotaring signal and right-hand rotation
Uncontrolled three kinds of signal compositions of signal.So choose typical straight and turning left special signal, straight trip and the uncontrolled signal of turning right,
Left-hand rotation special signal and uncontrolled three kinds of situations of signal of turning right are analyzed.
In view of influence of the turn inside diameter to speed, and uncontrolled right-turning vehicles and motor vehicle and non-motor vehicle rush
Prominent problem etc. can all influence the ability that is diverted through of vehicle, therefore, passing through for phase and phase vehicle of keeping straight on be turned in analysis
On the basis of the comparative analysis of ability, then carry out bandwidth comparative analysis.Intersection straight trip, turn left, right-hand rotation handling capacity comparative analysis.
A) straight and turning left (having special left rotaring signal)
There is the left turn lane that signal controls compared with Through Lane, the different main bodies of the vehicle number passed through in same time
In terms of present speed, turning speed will be less than the speed of straight-line travelling vehicle.Vehicle speed when turning has certain
Decline, the change of speed is mainly reflected in the size of radius of turn, and radius of turn is bigger, and speed more tends to be steady, radius of turn
Smaller, speed fall is bigger.The vehicle number that the slower same time of vehicle movement passes through is fewer, and the vehicle that turns left to turn around
Also there is retardation to the vehicle for subsequently waiting in line to turn left.Therefore, consider influence of the radius of turn to speed and fall
The loss of delay time caused by head vehicle, both factors were to having the influence that signal control is turned left by vehicle number, and Through Lane
The vehicle number passed through in same time is contrasted.
Linear model based on correction factor method is pointed out：
In formula：frFor radius of turn affecting parameters, r is radius of turn.
Through Lane passes through vehicle number：
In formula：SsPass through vehicle number, h for Through LanesFor average headway, geFor effective green time.
Left turn lane passes through vehicle number：
In formula：SLPass through vehicle number, t for left turn lanesThe time is lost for u-turn, the loss time of turning around here is for falling
The situation of head and left-hand rotation Shared Lane, single left turn lane do not consider to turn around to lose the time, and other specification value is as above.
By formula it can be seen that straight trip handling capacity is significantly greater than left-hand rotation handling capacity, therefore, when doing green wave coordination,
Left-hand rotation green wave band width should be increased, ensure that emergency relief fleet can pass through.
B) keep straight on and turn right (without special right turn signal)
The right-turning vehicles of non-mandrel roller can be clashed with pedestrian and non motorized vehicle current when, it is assumed that right-hand rotation car
To avoid pedestrian as criterion, the non-motor vehicle meeting in the right-turning vehicles of west eastwards and west straight trip non-motor vehicle eastwards and south orientation north
Clash, to avoid nearby as criterion, same entrance driveway avoids non-motor vehicle with motor vehicle, and adjacent entrance driveway is can pass through
Critical gap theory is that criterion discussion passes through vehicle number.
Right-turn lane passes through vehicle number：
Pn=P (μ+(n-1) μ0<H<μ+nμ0) (28)
In formula：SRPass through vehicle fleet to turn right,For during red light by vehicle number,To pass through car during green light
, L is to be lined up non-motor vehicle length, VfFor the non-motor vehicle speed freely to dissipate, λjFor emergency relief vehicle arrival rate, trFor
Red time, PnTo meet the probability that passes through of poisson arrival, H is non-motor vehicle spacing, and other specification implication is as above.
C) turn left (having special signal) and turn right (no special signal)
Be indicated above, the loss of delay time caused by considering influence and the vehicle that turns around of the radius of turn to speed this
Two kinds of factors are to having the influence that signal control is turned left by vehicle number, the calculating turned left by vehicle number.
The right-turning vehicles of non-mandrel roller can be clashed with pedestrian and non motorized vehicle current when, to avoid pedestrian
With can theoretical inquired into for criterion of crossing gap pass through vehicle number.
Straight trip, turn left, right-hand rotation bandwidth comparative analysis
On the basis of different turn signal phase handling capacity differences, analysis turns to the difference of bandwidth and bandwidth of keeping straight on,
And it is different turn between bandwidth difference.Handling capacity is bigger, represent the unit interval in it is more by vehicle number, and turn left and
Turn right for straight trip, all cause handling capacity to reduce along with the reason such as the decline of speed, conflict, it is therefore, identical green
In wave width, straight trip is most by vehicle number.So with the difference of handling capacity, represent to turn to phase relative to straight trip phase
The difference of bandwidth.
There are special left rotaring signal bandwidth and straight trip bandwidth contrast, there is special right turn signal bandwidth to contrast and have with straight trip bandwidth
Special left rotaring signal bandwidth without the contrast of special right turn signal bandwidth with being shown below：
Stepped path total bandwidth：
In formula：ws,wL,wRRespectively keep straight on, turn left, right-hand rotation bandwidth, other specification implication is as above.
Fig. 6 is the signal time distributing conception figure of the present invention, and the historical datas such as data on flows are imported into signal timing optimization software
In SYNCHRO, present situation timing scheme is drawn, forms Fig. 6 phase phase sequence figure.Bi-level Programming Models are solved using genetic algorithm
The signal time distributing conception of each intersection.Solution is optimized to the dynamic phasing difference on upper strata with genetic algorithm first, target is
Allow emergency relief vehicle all can be not parking by each intersection during green light；Secondly it is green to lower floor with genetic algorithm
Ripple Bandwidth Model is solved, and solution can make the not parking maximum bandwidth by each intersection of emergency relief vehicle.Finally with
The maximum of whole piece path bandwidth is fitness function, and in the cycle, emergency relief coordination phase split, phase difference is that decision-making becomes
Measure, it is 0.90 that genetic cross probability is chosen in case, mutation probability 0.01；Population scale is 50；Maximum iteration is
100.Concrete operation step is as follows：
(1) genetic algorithm basic parameter value is determined, inclusive fitness function is chosen, and is up to fitness function with bandwidth,
Encoding and Decoding, coding use binary coding, and operation is simple for binary coding, are easy to subsequently selected, intersection and become
It is different to wait genetic manipulation, and meet minimum glossary of symbols cryptoprinciple.Determine crossover probability, mutation probability, population scale, iteration time
Number.
(2) chromosome coding is carried out using binary approach using each intersection phase difference as gene, forms scheme population, with
Scheme is as initial population when machine selection one assembles.
(3) bring fitness function into and solve ideal adaptation angle value, using roulette selection method, select fitness maximum
Individual is intersected, and typically chooses simple single-point cross method, is then intersected result and is entered row variation again.
(4) selection is eventually passed through, intersect, the individual of variation carries out binary decoded computing, judges end condition, that is, reaches
To maximum iteration.
Obtained signal time distributing conception is as shown in the table：
The signal time distributing conception of table 1
By to analysis of statistical results under three kinds of simulation scenarios, drawing whole path emergency relief average traffic delay, average row
Team leader's degree, journey time, average stop frequency, as shown in table 2.
The simulation evaluation result of table 2
Simulation result shows：The positive effect of signal coordinating priority scheme is better than other schemes, as follows specific to each index
It is shown：
(1) do not take any preference strategy emergency relief vehicle be delayed it is larger, journey time is longer；Take Single Intersection
Signal priority can make delay reduce 14%, and journey time reduces 12%, and queue length reduces 27%, and stop frequency reduces 22%,
But for intersection, intersection average traffic delay is set to add 2.3%.
(2) signal coordinating preference strategy is taken relative to no signal preference strategy, and emergency relief delay can be made to reduce 35%,
Journey time reduces 18%, and queue length reduces 36%, and stop frequency reduces 38%, and to whole intersection average traffic delay
There is improvement, delay reduces 20%.
(3) signal coordinating preference strategy is taken to prolong emergency relief for Single Intersection signal priority strategy
Reduce 24% by mistake, journey time reduces 6%, and queue length reduces 12%, and stop frequency reduces 21%, and the total car in intersection prolongs
Reduce 22% by mistake.
Therefore it is concluded that：
(1) it is a kind of that control dual layer resist optimization method is coordinated in the path of the emergency relief proposed according to emergency relief feature
The method of Emergency Relief in effective solution actual life.The journey time of emergency relief can be effectively reduced, is made tight
The total delay that first aid is helped is minimum.
(2) dual layer resist optimization method not only farthest reduces the delay of emergency relief, by with other schemes
Compare, this method is also performed meritorious deeds never to be obliterated for the delay for improving whole intersection in the method for the coordination control aspect of lower floor.
(3) dual layer resist optimization method is compared to single shop signal priority strategy, for other vehicles disturbance effect also most
It is small.
Claims (7)
- A kind of 1. coordinating control of traffic signals optimization method towards emergency relief vehicle driving path, it is characterised in that：Including The division of emergency relief priority level, path type division, signal priority control, signal coordinated control, Bi-level Programming Models, with road Footpath is that research object carries out related coordination control research；First, emergency relief feature and target analysis are carried out；Then, it is based on Bi-level Programming Models, study the dynamic phasing difference on upper strata under different path forms and the path green wave coordination of lower floor；Finally, carry out Related simulation case analysis and checking.
- 2. the coordinating control of traffic signals dual layer resist according to claim 1 towards emergency relief vehicle driving path is excellent Change method, it is characterised in that：The emergency relief priority level division：It is other to different priorities tight according to emergency relief feature Anxious breakdown lorry is classified, and considers emergency relief vehicle type, intersection signal timing, category of roads, fleet's rule Mould factor, its degree of priority is determined, priority level highest is ambulance, natural calamity wrecking truck, fire fighting truck, is secondly Police car, breakdown lorry, traffic accident tractor, it is finally evacuating personnel car, emergency relief goods and materials car.
- 3. the coordinating control of traffic signals optimization method according to claim 1 towards emergency relief vehicle driving path, It is characterized in that：The path type division：To the fundamental type and combining form of outbound path, wherein fundamental type includes straight trip Path, straight trip left-hand rotation path, straight trip right-hand rotation path, combining form include stepped path and U-shaped path.
- 4. the coordinating control of traffic signals optimization method according to claim 1 towards emergency relief vehicle driving path, It is characterized in that：The signal priority control：According to current phase green time and emergency relief arrival time, decision is taken green Lamp lights in advance or green light extends.
- 5. the coordinating control of traffic signals optimization method according to claim 1 towards emergency relief vehicle driving path, It is characterized in that：It is described to coordinate control：The green wave pattern in whole piece path is established, whole path signal is carried out a signal coordinating Control.
- 6. the coordinating control of traffic signals optimization method according to claim 1 towards emergency relief vehicle driving path, It is characterized in that：The Bi-level Programming Models, study the dynamic phasing differential mode type on upper strata and the road of lower floor under different path forms Footpath green wave coordination:When queue length and emergency relief arrival are estimated in front of dynamic phasing difference aspect, foundation emergency relief fleet Between, the dynamic phasing for calculating each intersection relative to previous intersection is poor；In the green ripple aspect in emergency relief path, foundation path The solution of losing of steering feature and handling capacity turns to bandwidth and is contrasted with straight trip bandwidth, is solved using genetic algorithm maximum Bandwidth.
- 7. the coordinating control of traffic signals optimization method according to claim 1 towards emergency relief vehicle driving path, It is characterized in that：The simulation case analysis and checking：Dual layer resist traffic is believed with traffic simulation software VISSIM Number coordination control strategy, Single Intersection signal priority strategy and no signal preference strategy have carried out simulation analysis, and control is coordinated in contrast The average traffic delay queue length of emergency relief vehicle under system strategy, Single Intersection signal priority strategy and no signal preference strategy, Journey time, stop frequency and intersection total delay.
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