CN103696336A - Stacked soft flyover system of crossroad and three-way intersection - Google Patents
Stacked soft flyover system of crossroad and three-way intersection Download PDFInfo
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- CN103696336A CN103696336A CN201310630902.9A CN201310630902A CN103696336A CN 103696336 A CN103696336 A CN 103696336A CN 201310630902 A CN201310630902 A CN 201310630902A CN 103696336 A CN103696336 A CN 103696336A
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Abstract
The invention discloses a stacked soft flyover system and relates to a stack area arranged at a crossroad and a three-way intersection. A parallel go-through control mode is adopted for stack vehicles and red and green light two-phase control without left and right turn lights is adopted at the same time, so that the waiting time of the vehicles is effectively reduced. The stacked soft flyover system disclosed by the invention belongs to the technical field of traffic control, and a reasonable stack area can be obtained by virtue of quantum chemistry calculation at the same time. Cross roads or three-way intersections in modern cities generally adopt red and green light control, but due to the conflict between left turn vehicles and straight ahead vehicles, the traffic efficiency is reduced. According to the stacked soft flyover system disclosed by the invention, a stack area is reasonably arranged on a main traffic road, and by virtue of the parallel principle, the left turn waiting time can be quickly, effectively and adaptively reduced, the traffic conflicts are reduced and any operations of left turn, right turn and the like can be realized; besides, the stack area also has an emergency area for placing vehicles having an accident. The stacked soft flyover system disclosed by the invention is suitable for each planar intersection in cities. The number of lanes can be increased or reduced according to conditions of intersections. The stacked soft flyover system uses a stack principle and a mode of changing series into parallel to improve the traffic capacity of planar traffic intersections, is suitable for designing intersection soft flyovers of major-major and major-auxiliary roads, and can be used for improving the traffic emergency transport capacity.
Description
Technical field
The present invention is a kind of cross and the soft intersection system of fork in the road stacking-type, belongs to technical field of traffic control.
Background technology
At present, urban traffic control is a very large order, and in general, urban traffic control adopts various ways:
(1) timing controlled: traffic control adopts Traffic signal control, by the timing scheme operation of setting in advance, timing according to the historical data that is the traffic volume.In one day, only by single period timing controlled of being called of a timing scheme, in one day, the different periods are selected multi-period timing controlled of being called of different timing schemes.According to historical traffic data, determine the method for its optimization timing.The most frequently used signal timing dial method has now: Welbert method, critical lane method, stop line method, conflict point method.Time control method is the widest a kind of traffic control mode of using at present, and it is relatively adapted to the variation of vehicle flowrate rule, the vehicle flowrate crossing of (even close to saturation state) greatly.But because its timing scheme obtains according to the historical data of traffic study, and just remain unchanged once determining, until readjust next time.Obviously, this mode can not adapt to the change at random of traffic flow, thereby its control effect is poor.
(2) induction is controlled: actuated signal control does not have the fixing cycle, operating principle is the import at actuated signal control, be equipped with wagon detector, when a certain signal phase starts to open, give a green light, in actuated signal control device, set in advance one " initial green light time ".While finishing to initial green light time, increase a preset time interval, if do not have follow-up vehicle to arrive at this moment in interval, change immediately phase place; If follow-up vehicle detected, arrive, a car often detected, just from detecting moment of vehicle, preset " a unit green extension " of green light phase place prolongation.Green light can extend to one preset " maximum green time " always.When phase place Green extension arrives maximum value, even if detector has still detected and sent a car, also to interrupt the right of way of this phase place, switching signal phase place.Induction control method is owing to can carrying out according to the variation of traffic the timing scheme of conditioning signal, therefore than time control method, has better control effect, is specially adapted to that traffic volume temporal evolution is large and irregular, primary and secondary phase place vehicle flowrate differs larger crossing.The defect that induction control method exists is, whether induction is only controlled has vehicle arrival to make a policy according to green light phase place, and comprehensively the vehicle arrival situation of other red light phase place is carried out decision-making, therefore it cannot really respond the transport need of each phase place, also just can not make the total delay of vehicle minimum.
(3) Self Adaptive Control: continuous measurement traffic flow, itself and the dynamic characteristic of wishing are compared, utilize difference to change the adjustable parameter of system or to produce a control, thereby no matter guarantee how environment changes, all can make to control effect and reach optimum.Adaptive control system has two classes, i.e. timing parameter real-time selection system and real-time traffic Simulations system.
Timing parameter selective system is before system puts into operation, drafts the contrast relationship of a set of timing parameter and traffic rank, for the traffic volume of different brackets, selects the timing parameter combination of corresponding optimum.The timing parameter syntagmatic corresponding to the traffic volume that this cover is drafted is in advance stored in central control computer, central control computer is by being located at the wagon flow throughput data of the wagon detector feedback of each intersection, automatically select suitable timing parameter, and carry out the real-time control to road network traffic signals according to selected timing parameter combination.
Real-time traffic Simulations system does not need to store any set timing scheme in advance, does not need to determine in advance the corresponding selection relation of a set of timing parameter and the traffic volume yet.It is to rely on certain traffic Mathematical Modeling that is stored in central computer, the real time traffic data feeding back is analyzed, and timing parameter is optimized and revised.The optimization of timing parameter is that the predicted value with integrated objective function (delay time at stop, stop frequency, the degree of crowding and oil consumption etc.) is foundation.Therefore, it can guarantee all operations under best timing scheme is controlled of whole road network when section in office.
As a whole, Adaptable System be controlled at the real-time detection that depends on to a great extent traffic flow data, so system is very high to the precision of traffic checkout equipment and traffic data transmission equipment and reliability requirement.Compare with timing system, the equipment configuration of adaptive control system is much complicated, and it is high a lot of that construction investment is wanted.
Exactly because traffic control problem exists above-mentioned complicated factor, need to adopt the technology of some other necessity to be improved, can alleviate congested traffic condition.
Summary of the invention
The object of the present invention is to provide a kind of crossroad and the soft intersection system of fork in the road stacking-type, utilize heap stack mechanism and deserialize mode, improve the plane traffic cross-road traffic capacity, be applicable to main, master, the soft grade separation design in crossroad of main and auxiliary road.
To achieve these goals, technical scheme of the present invention is as follows.
A kind of crossroad stack region access control mode that walks abreast, according to the principal contradiction of urban traffic, concentrate on left turning vehicle and through vehicles clashes, cause whole passage phase-splitting to advance, hindered traffic efficiency, stack region is rationally set on primary path, by parallel principle, can accomplish quick, effective, the adaptive minimizing left-hand rotation stand-by period, reduce wagon flow conflict, can realize any left-hand rotation, turn right, the operations such as tune, separately also possess emergent district, can settle the vehicle having an accident.This invention is applicable to each grade crossing of city.On the magnitude setting of track, can increase or reduce according to crossing situation.
This beneficial effect of the invention is: this invention utilizes heap stack mechanism and deserialize mode, improves the plane traffic cross-road traffic capacity, is applicable to the soft grade separation design in crossroad main, major-minor road, has improved emergency traffic transport capacity.The current mode (example one) of stacking-type that has designed a kind of four arrow four stars, is mainly used in the current of common crossroad.The current mode (example two) of storehouse that has designed a kind of eight arrow eight stars, Jiang Fu widens in road to two lane highways, realizes the current design in larger wagon flow crossroad.Designed the current mode (example three) in a kind of fork in the road.
Accompanying drawing explanation
Fig. 1 is traffic control schematic diagram in the embodiment of the present invention 1.(example one soft grade separation four arrow four heart shapes in crossroad)
Fig. 2 is traffic control schematic diagram in the embodiment of the present invention 2.(example two soft grade separation eight arrow eight heart shapes in crossroad)
Fig. 3 is traffic control schematic diagram in the embodiment of the present invention 3.(example three fork in the road shapes)
The specific embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described, to better understand the present invention.
embodiment 1:the less crossroad access rule area of left-hand bend vehicle is example
The crossroad stack region access control mode that walks abreast is provided with stack region on primary path A, B, C, D, is respectively between P4L4, between P1L1, between P2L2 and between P3L3.By parallel principle, can accomplish quick, effective, the adaptive minimizing left-hand rotation stand-by period, reduce wagon flow conflict, can realize any left-hand rotation, right-hand rotation, tune etc.The region more than needed forming between circle or square region (E, F, H, G), can arrange emergent district, also can be in order to flower bed, plantation urban greenery plants to be set, in order to beautify the environment.
First calculate the size of stack region, according to left turning vehicle is less, calculate, suppose that left turning vehicle single track wait length S=120m calculates, because stack region is 4 tracks, if stack region will digest left turning vehicle completely, need 120m/4=30m, be also that stack region at least arranges 30m length.Wherein, according to the single track length computation of 120m, suppose by the average speed V of crossing vehicle
eventually=30km/h, accelerates since 0 at vehicle, and, in the situation that acceleration is constant, the omnidistance average speed of vehicle is V
on average=15km/h, is equivalent to 4m/s, and green time is at least t
1=S/V
on average=120/4=30s; Another part time is for automobile is waited for the time starting, because front truck is not walked, rear car is also difficult to start, according to rear car, compared with front truck, starting slow 1s calculates, suppose that vehicle commander's degree is 4m, following distance 2m, the vehicle number of waiting in line is expected to be 120m/(4m+2m)=20, the vehicle that comes position, end is waited for t start-up time
2=20s, total green time is t
green=t
1+ t
2=30+20=50s.As long as green light setup times is less than t
green, can guarantee that space, stack area is abundant.Equally, if stack area is three tracks, stack area length is 120/3=40m, according to track, decides stack area minimum length.In this example, we can get green time 40s, stack area length 30m, and it is 5s that stack area vehicle empties the time.
In this embodiment, the specific embodiment is,
AB direction: vehicle, from A point, is stopped at A2 track, when P4 is green light, after traffic lights P4, changes one's profession to A1 track, and through traffic lights S4, enters P3L3 stack area clockwise around the G heart, waits for and keeping straight on, and when traffic lights S3 green light, keeping straight on to sail reaches B point.
AC direction: vehicle is from A point, and through P4, S4, arrives C point.
AD direction: vehicle, via A1 track, arrives D point fast.
Other all directions principle is identical, repeats no more.
Here lifting a current cycle explains, and gets green time 40s, and a current periodic packets adds 2 containing 2 green times and empties the stack district time, is 40 * 2+10=90s
During 0-40s: traffic lights P4, S4, P2, S2 green light, P1, S1, P3, S3 red light, AC direction through vehicles, by A3, A4 track, travels smoothly via P4, L4, S4; CA direction through vehicles, by C3, C4 track, travels smoothly via P2, L2, S2; AB direction vehicle, through A2 track, by P4, L4, S4, enters P3L3 storehouse around the G heart, stops at L3 start-finish line, and its vehicle can be stopped at any track, stack area; CD direction vehicle, through C2 track, by P2, L2, S2, enters P1L1 storehouse around the E heart, stops the start-finish line with L1; AD direction vehicle can be turned right through A1 track; CB direction vehicle can be turned right through C1 track; BA direction vehicle can be turned right through B1 track; DC direction vehicle can be turned right through D1; BC direction vehicle, by B2 track, stops at red light P1 stop line; DA direction vehicle, by D2 track, stops at red light P3 stop line; BD direction vehicle, stops at red light P1 stop line; DB direction vehicle, stops at red light P3 stop line.
During 40-45s: P1, P2, P3, P4, S1, S3 red light, S2, S4 green light, carry out P2L2, P4L4 stack district empties operation.P2L2 stack district, P4L4 stack district, vehicle continues to keep straight on; AC direction, AB direction vehicle stop at P4 stop line; CA direction, CD direction vehicle are stopped at P2 stop line; Other is constant.
During 45-85s: traffic lights P1, S1, P3, S3 green light, P2, S2, P4, S4 red light, BD direction through vehicles, by B3, B4 track, travels smoothly via P1, L1, S1; DB direction through vehicles, by D3, D4 track, travels smoothly via P3, L3, S3; BC direction vehicle, through B2 track, by P1, L1, S1, enters P4L4 storehouse around the H heart, stops at L4 start-finish line, and its vehicle can be stopped at any track, stack area; DA direction vehicle, through D2 track, by P3, L3, S3, enters P2L2 storehouse around the F heart, stops the start-finish line with L2; AD direction vehicle can be turned right through A1 track; CB direction vehicle can be turned right through C1 track; BA direction vehicle can be turned right through B1 track; DC direction vehicle can be turned right through D1; AB direction vehicle, by A2 track, stops at red light P4 stop line; CD direction vehicle, by C2 track, stops at red light P2 stop line; AC direction vehicle, stops at red light P4 stop line; CA direction vehicle, stops at red light P2 stop line.
During 85-90s: P1, P2, P3, P4, S2, S4 red light, S1, S3 green light, carry out P1L1, P3L3 stack district empties operation.P1L1 stack district, P3L3 stack district, vehicle continues to keep straight on; BD direction, BC direction vehicle stop at P1 stop line; DB direction, DA direction vehicle are stopped at P3 stop line; Other is constant.
Return 0s.
This kind of mode left turning vehicle can be selected any track after sailing storehouse into, by serial, changes parallel mode into, and do not conflict mutually with follow-up vehicle, can realize fast passing.And during each cycle 90s, the effective transit time of all directions reaches 40s, more old-fashioned current mode 23s improves traffic efficiency 75%.
embodiment 2:the more crossroad access rule area of left-hand bend vehicle is example
Example 2 is identical in example 1 principle, at this, no longer repeats.Example 2 will enter Fu road, stack district and change 2 tracks into, wait for that left turning vehicle can arrange independent 2 tracks, also can bicycle road and through vehicles share 1 road, crossing be it seems and reaches eight arrow eight heart shapes, more attractive in appearance.Example 2 be mainly used in crossing be open to traffic more, the large crossing that the current cycle is long.Suppose that all directions wait length single track is 240m, a direction 4 tracks always wait for that length is 240 * 4=960m, according to 1 car 6m, calculate, and a direction is waited for gross vehicle and is 160.Suppose 120 craspedodromes, 40 left-hand rotations, stack area length is 40/4 * 6=60m, according to by the speed of crossing 30km/h, is also 8m/s, emptying stack district needs 8s.240m, by 60s+40s=100s consuming time, is to be all also 216s in the cycle, and the one-way trip time is 100s.More old-fashioned transit time 216/4=54s, has promoted current rate nearly 90%.
embodiment 3:take fork in the road traffic rules as example
Example 3 is trident or T-shaped road junction passage mode, and cycle analysis is as follows.
Get single track and wait for length 120m, establish 2 tracks, left turning vehicle Accreditation Waiting Area, 4 tracks, stack area, P1L3 length in stack area is 60m, empties stack district time 8s, stacked time 40s.The cycle is 40 * 2+8=88s
0-40s:P2, S2, P3, S3 craspedodrome green light, S3 left-hand rotation red light, P1 red light, AC direction, CA, CB direction are normally travelled, and AB direction vehicle is stopped at L3 stop line place.BA, BC direction stop at L1 place.
40-45s:S3 craspedodrome green light, S2 green light, P3 red light, P2 green light, P1 red light, empties P1L3 stack district.
45-48s:S3 craspedodrome green light, S2 green light, P3 red light, P2 red light, P1 red light, continues to empty P1L3 stack district, clears out P2L4 crossing vehicle simultaneously.
48-88s:S2 red light, P3 red light, P2 red light, P1 green light, S3 left-hand rotation green light, S3 craspedodrome red light, AC, CA direction stop, and BC, BA, AC direction are advanced, and wherein BC direction vehicle enters P1L3 stack area, stops at L3.
Return 0s.
The present embodiment is applicable to each grade crossing of city.On the magnitude setting of track, can increase or reduce according to crossing situation.In cycle 88s, the effective transit time of all directions is 40s, more old-fashioned 88s/3=30s, and traffic efficiency has improved 33%.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (6)
1. crossroad and the soft intersection system of fork in the road stacking-type, is characterized in that: each track of crossroad and fork in the road arranges stack region, for storehouse vehicle, takes parallel current control mode.
2. crossroad and the soft intersection system of fork in the road stacking-type, is characterized in that: adopt Si Tiaofu road formation closed hoop or closed polygon shape to connect into stack region, form four arrow four hearts (emergent district, Si Fu road four) or eight arrow eight heart shapes.
3. according to a kind of crossroad described in claim and the soft intersection system of fork in the road stacking-type, it is characterized in that: adopt traffic lights two phase controls, without left and right turn indicator lamp.
4. according to a kind of crossroad described in claim and the soft intersection system of fork in the road stacking-type, it is characterized in that: stack region side is provided with emergent district, can dispose emergent and accident vehicle.
5. according to a kind of crossroad described in claim and the soft intersection system of fork in the road stacking-type, it is characterized in that: on the magnitude setting of described track, according to crossing situation, increase or reduce.
6. according to a kind of crossroad described in claim and the soft intersection system of fork in the road stacking-type, it is characterized in that: invented a kind of computational methods of calculating stack region size, required this kind of measuring and calculating mode to protect.
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| CN105887594A (en) * | 2014-05-09 | 2016-08-24 | 吴钦凡 | Road intersection |
| CN104200719B (en) * | 2014-07-24 | 2016-10-05 | 北方工业大学 | Induction control method of multifunctional traffic signal control lamp panel |
| CN109509369A (en) * | 2018-12-23 | 2019-03-22 | 合肥工业大学 | Intelligent car position monitoring method and its monitoring system, city integrated intelligent transportation system |
| CN109584580A (en) * | 2018-12-23 | 2019-04-05 | 合肥工业大学 | A kind of city intelligent traffic light control method and intelligent control system of traffic light |
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Application publication date: 20140402 |