CN108399759A - Continuous flow intersection left-turn non-motor traffic design method - Google Patents
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Abstract
The present invention relates to a kind of continuous flow intersection left-turn non-motor traffic design methods, for this intersection type in continuous flow intersection, the pass space of its left-turn non-motor traffic and signal control are optimized, to eliminate conflicting for left-turn non-motor at main signal and straight trip motor vehicle, on the basis of ensureing current safety, the automobile traffic stream traffic capacity is improved；The design method is in terms of spatial design, the pre- stop line of setting straight trip motor vehicle and left-turn non-motor passage lanes at the pre-signal of continuous flow intersection, left-turn non-motor track is set between motor vehicle exit lane and left turn lane, to provide left-turn non-motor passage space path；Signal control aspect, increase the control to motor vehicle of keeping straight at pre-signal, and optimization aim is up to motor vehicle throughput, it is contemplated that signal phase phase sequence, respectively flows to the constraintss such as long green light time, saturation degree at cycle duration, establishes linear programming model and optimizes.
Description
Technical field
The present invention relates to a kind of intersection spaces and signal control design case method, more specifically to a kind of continuous flow
Space and signal control design case method of the intersection for left-turn non-motor traffic.
Background technology
Level-crossing is the bottleneck node of urban highway traffic, and in order to improve intersection efficiency, one kind is known as connecting
The non-general intersection of afterflow intersection is suggested.Pre-signal, and the car lane that will turn left is arranged in main signal upstream in the design
It moves on the left of motor vehicle exit lane, to the transfer that conflicts for Vehicle flow that left-hand rotation Vehicle flow at main signal and opposite direction are kept straight on
To intersection upstream pre-signal, conflicting for left-hand rotation Vehicle flow at main signal and opposite straight trip Vehicle flow is eliminated so that main
Signal can be run with two phase place, improve intersection capacity.However, current design does not propose Manpower Transportation
Targetedly measure, left-turn non-motor has no targetedly excellent with motor-driven workshop of keeping straight on there are still conflicting at main signal
Change design method, and does not also retrieve the patent of invention of such methods.
Through the literature search of existing technologies, the optimization design in relation to signalized crossing mainly has following several
A aspect：
1, conventional signalized crossing geometry designs.Specifically include the current sky of intersection motor vehicle and non-motor vehicle
Between and rule, lane width, lane function division etc..China《Urban road intersection plans specification GB50647-2011》、
《Urban road engineering design specification CJJ 37-2012》、《Urban road intersection design discipline CJJ 152-2010》In to it
There are relevant regulations.
2, conventional signalized crossing signal control.Specifically include signal phase phase sequence, cycle duration, respectively flow to it is green
Lamp time distribution etc..Include in the basic stock of China《Urban traffic control》、《Traffic administration and control》Deng.
3, continuous flow intersection is designed.Continuous flow intersection is a kind of unconventional intersection design method, the design side
Method is situated between in the patent of invention " Continuous flow intersection " (application number US5049000) in the U.S.
It continues；Research report " Alternative Intersections Interchanges Informational Report "
(No.FHWA-HRT-09-060), scientific paper " Optimal operation of displaced left-turn
intersections：To the spatial design and letter of its automobile traffic in the achievements in research such as A lane-based approach "
Number control is described；Scientific paper " Geometric and Operational Improvements at
Continuous Flow Intersections to Enhance Pedestrian Safety " set the space of pedestrian traffic
Meter and signal control are described；And according to the micro- (https that gives out information of Ministry of Public Security's traffic safety：//weibo.com/
2501519087/FqKutCdRzType=comment#_rnd1517728053995), continuous flow intersection is in ShenZhen,GuangDong
It is applied.
Method 1 and method 2 are there has been at present more mature for the design method of normal signal control intersection
Technological achievement.
Method 3 proposes this intersection type in continuous flow intersection, by by left-hand rotation Vehicle flow at main signal with it is right
It is transferred to intersection upstream pre-signal to the conflict of straight trip Vehicle flow, makes straight and turning left at main signal that can let pass simultaneously, carries
The high traffic capacity of intersection.
But in China, Manpower Transportation is a kind of important travel modal, and intersection is controlled for normal signal,
Manpower Transportation uses current mode identical with motor vehicle.For continuous flow intersection, current design method is mainly
For automobile traffic, conflicting for left-hand rotation Vehicle flow at main signal and opposite straight trip Vehicle flow is eliminated, but have ignored
For main signal using under the signal control condition of two phase place, left-turn non-motor will generate punching with this to opposite direction straight trip motor vehicle
It is prominent.Therefore, the prior art lacks closes for continuous flow intersection Manpower Transportation, especially left-turn non-motor more science
The design method of reason.
Invention content
In view of the drawbacks of the prior art, the present invention is to provide for a kind of continuous flow intersection left-turn non-motor traffic design
Method, this method will conflict with this to opposite straight trip motor vehicle for left-turn non-motor, to left-turn non-motor traffic
Pass space and signal control optimize, to eliminate above-mentioned conflict, on the basis for ensureing current safety
On, improve the automobile traffic stream traffic capacity.
To achieve the above object, the technical solution adopted by the present invention is as follows：
A kind of continuous flow intersection left-turn non-motor traffic design method, including spatial design and signal control, it is described
Spatial design：The pre- stop line of setting straight trip motor vehicle and left-turn non-motor passage lanes at the pre-signal of continuous flow intersection,
Left-turn non-motor track is set between motor vehicle exit lane and left turn lane, is passed through to provide left-turn non-motor
Space path；The signal control, increases the control to motor vehicle of keeping straight on, and be up to motor vehicle throughput at pre-signal
Optimization aim considers signal phase phase sequence, cycle duration, respectively flows to long green light time, saturation degree constraints, establishes linear programming
Model optimizes, and to eliminate conflicting for left-turn non-motor at main signal and straight trip motor vehicle, is ensureing current safety
On the basis of, the automobile traffic traffic capacity is improved, wherein：Signal controls optimization aim：It is up to optimization with motor vehicle throughput
Target, as shown in formula (1),
In formula：Z is intersection motor vehicle maximum throughput, veh/h；I numbers for intersection fork, and i=1 indicates Dong Cha
Mouth, i=2 indicate that southern fork, i=3 indicate that western fork, i=4 indicate north fork；J numbers for traffic direction, j=1 expressions left-hand rotation,
J=2 indicates that straight trip, j=3 indicate to turn right, and j=4 indicates outlet；μ is intersection discharge coefficient；qijFor the motor-driven of the forks i j flow directions
Vehicle transport need, veh/h；
The signal phase phase sequence：Main signal controls for two phase place, respectively thing passage phase and north and south passage phase；
Pre-signal controls for two phase place, and respectively outlet is passed through with the current phase of import straight trip and left-hand rotation motor vehicle with left-turn non-motor
Phase；Consider the coordination of main signal and pre-signal, it is desirable that two troubles of main signal thing passage phase green light start time and thing
The outlet of mouth pre-signal is kept straight on import, and flow direction current phase green light start time is identical, and main signal north and south passage phase green light starts
Moment is identical as import straight trip flow direction current phase green light start time as the outlet of the north and south forks Liang Ge pre-signal, that is, meets formula
(2)-(9) it requires；
In formula：giFor the forks main signal i green light start time, the relative time being used in a signal period indicates, is 0
Number between to 1；λiFor the forks main signal i green light duration, the relative time being used in a signal period indicates, is 0
Number between to 1；I is green light time interval, s；Green light start time is flowed to for pre-signal i fork j, is used in a signal
Relative time expression in period, the number between O to 1；Green light duration is flowed to for pre-signal i fork j, is used in one
Relative time in a signal period indicates, is the number between 0 to 1；
The cycle duration constraint：It is required that main signal is identical as pre-signal cycle duration, and rational minimum and maximum
Within the scope of signal period duration, to ensure that it is line style model to be established model, is indicated using the inverse in period, that is, meet formula (10)
It is required that；
In formula：ξ is the inverse of signal period duration, s；CmaxAnd CminRespectively minimum and maximum signal period duration, s；
It is described respectively to flow to long green light time constraint：It is required that each long green light time that flows to should meet minimum long green light time requirement, especially
It should be noted that left turn phase long green light time should meet left-hand rotation bicycle crossing signal length demand at pre-signal, that is, meet formula (11)-
(12) it requires；
In formula：GiminFor the requirement of the forks main signal i minimum green light duration, s；It is flowed to for pre-signal i fork j
Minimum green light duration requirement, s；
The saturation degree constraint：It is required that each saturation degree that flows to is limited no more than maximum saturation, that is, meet formula (13)-
(14) it requires；
In formula：dmaxIt is limited for maximum saturation；sijSaturation volume rate, veh/h are flowed to for main signal i fork j；To believe in advance
Number forks i j flows to saturation volume rate, veh/h.
Compared with prior art, the present invention having the following advantages and beneficial effect：
1, the present invention provides a kind of spatial designs and signal controlling party for continuous flow intersection left-turn non-motor
Method；
2, method of the invention eliminates rushing for left-turn non-motor and motor vehicle of keeping straight at the main signal of continuous flow intersection
It is prominent；
3, method of the invention can ensure non-maneuver current safety, and by reducing left-turn non-motor to straight trip
The interference of motor vehicle improves intersection autos only ability.
Description of the drawings
Fig. 1 is space design diagram in the present invention；
Fig. 2 is signal phase phase sequence schematic diagram in the present invention；
Fig. 3 is intersection geometrical condition schematic diagram in the embodiment of the present invention 1.
Specific implementation mode
The present invention will be further described with reference to the accompanying drawings.
A kind of continuous flow intersection left-turn non-motor traffic design method, including spatial design and signal control two
Point.In terms of spatial design, the pre- stop line of setting straight trip motor vehicle and left-turn non-motor are worn at the pre-signal of continuous flow intersection
Left-turn non-motor track is arranged in more channel between motor vehicle exit lane and left turn lane, to provide non-machine
Motor-car passage space path；Signal control aspect is increased the control to motor vehicle of keeping straight at pre-signal, and is passed through with motor vehicle
Amount is up to optimization aim, it is contemplated that and signal phase phase sequence, respectively flows to the constraintss such as long green light time, saturation degree at cycle duration,
It establishes linear programming model to optimize, to eliminate conflicting for left-turn non-motor at main signal and straight trip motor vehicle, protect
On the basis of the current safety of barrier, the automobile traffic traffic capacity is improved, wherein：
Spatial design, the pre- stop line A of setting straight trip motor vehicle and left-turn non-motor at the pre-signal of continuous flow intersection
Left-turn non-motor track E is arranged, to provide a left side in passage lanes B between motor vehicle exit lane C and left turn lane D
Turn non-motor vehicle passage space path F, as shown in Figure 1；
Signal controls, and is up to optimization aim with motor vehicle throughput, as shown in formula (1)；
In formula：Z is intersection motor vehicle maximum throughput, veh/h；I numbers for intersection fork, and i=1 indicates Dong Cha
Mouth, i=2 indicate that southern fork, i=3 indicate that western fork, i=4 indicate north fork；J numbers for traffic direction, j=1 expressions left-hand rotation,
J=2 indicates that straight trip, j=3 indicate to turn right, and j=4 indicates outlet；μ is intersection discharge coefficient；qijFor the motor-driven of the forks i j flow directions
Vehicle transport need, veh/h；
Signal phase phase sequence, as shown in Fig. 2, main signal controls for two phase place, respectively thing passage phase and north and south are logical
Row phase；Pre-signal controls for two phase place, respectively outlet and the current phase of import straight trip and left-hand rotation motor vehicle and the non-machine that turns left
Motor-car passage phase；Consider the coordination of main signal and pre-signal, it is desirable that main signal thing passage phase green light start time and east
Western two forks pre-signal outlet is identical as import straight trip flow direction current phase green light start time, main signal north and south passage phase
Green light start time is identical as import straight trip flow direction current phase green light start time as the outlet of the north and south forks Liang Ge pre-signal, i.e.,
Meet formula (2)-(9) requirement；
Linear programming model to output and input parameter as shown in table 1.
Table 1
Embodiment 1：
Continuous flow intersection geometrical condition in the embodiment of the present invention 1, as shown in figure 3, left-turn non-motor presses traditional design
It passes through along left-turn non-motor passage space path F at main signal, is to opposite direction straight trip motor vehicle formation conflict point with this
G.Using the method in the present invention, its spatial design and signal control are optimized, and is compared with traditional design scheme.
Design driver is：Each fork is turned left and straight-going traffic demand, qi1And qi2, 1000veh/h and 1500veh/h are taken respectively；Most
Big and minimum signal cycle duration, CmaxAnd Cmin, 120s and 60s are taken respectively；Main signal and pre-signal minimum green light duration
It is required that GiminAnd Gp ijmin, take 10s；Green light time interval, I take 4s；Main signal and pre-signal bicycle road saturation volume rate take
1800veh/h；Maximum saturation limits, dmax, take 1.0；Intersection non-motor vehicle respectively flows to flow, qb, take 1000bicycle/
h。
Detailed process is summarized as follows：
Step 1：By space design method of the present invention, setting straight trip motor vehicle stops in advance at the pre-signal of continuous flow intersection
Left-turn non-motor vehicle is arranged in line A and left-turn non-motor passage lanes B between motor vehicle exit lane C and left turn lane D
Road E eliminates to provide left-turn non-motor passage space path F on former left-turn non-motor passage space path
Conflict point G obtains spatial design scheme as shown in Figure 1.
Step 2：Above-mentioned input parameter is substituted into signal control line type plan model of the present invention.
Step 3：Above-mentioned model is linear programming model, and simplex method can be used or mathematical software (such as LINGO) is asked
Solution, signal timing plan are as shown in table 2.
Table 2
Step 4：Design research.Using autos only ability as evaluation index, to traditional design scheme and Ben Fa
Bright improvement project is compared.Shown in the autos only ability such as formula (15) of each track group in intersection.Traditional design scheme is believed
Number timing is identical as improvement project, but since straight trip autos only is interfered by left-turn non-motor, need to its saturation volume rate into
Row reduction, using HCM2010 formula, as shown in formula (16).
cij=Sijnijfijλij (15)
In formula：cijFor the traffic capacity of the intersection forks i j flow directions, veh/h；sijFor the saturation of the intersection forks i j flow directions
Flow rate uniformly takes 1800veh/h；fijFor the intersection forks i j flow direction saturation flow rate adjustment factor, for traditional design scheme
It needs to calculate using formula (16)；λijFor the split of the intersection forks i j flow directions.
In formula：qbijTo flow to the non-motor vehicle flow to conflict, bicycle/h with the intersection forks i j.
Result of calculation is as shown in table 3, and it is motor-driven to eliminate left-turn non-motor and straight trip in the present embodiment by the method for the present invention
Conflict of the vehicle at main signal, improves the passage safety of left-turn non-motor, and keeps straight trip motor vehicle and intersection overall
34.8% and 18.3% is respectively increased in the traffic capacity, and continuous flow intersection efficiency is made to be given full play to.
Table 3
This hair can be understood and applied the above description of the embodiments is intended to facilitate those skilled in the art
It is bright.Person skilled in the art obviously easily can make various modifications to this embodiment, and described herein
General Principle is applied in other embodiment without having to go through creative labor.Therefore, the present invention is not limited to implementations here
Example, those skilled in the art's announcement according to the present invention, improvement and modification made without departing from the scope of the present invention all should be
Within protection scope of the present invention.
Claims (1)
1. a kind of continuous flow intersection left-turn non-motor traffic design method, including spatial design and signal control, feature
It is：The spatial design：The pre- stop line of setting straight trip motor vehicle and left-turn non-motor at the pre-signal of continuous flow intersection
Left-turn non-motor track is arranged in passage lanes between motor vehicle exit lane and left turn lane, non-to provide
Autos only space path；The signal control, increases the control to motor vehicle of keeping straight on, and logical with motor vehicle at pre-signal
Excessively it is up to optimization aim, considers signal phase phase sequence, cycle duration, respectively flows to long green light time, saturation degree constraints, build
Vertical linear programming model optimizes, and to eliminate conflicting for left-turn non-motor at main signal and straight trip motor vehicle, is ensureing
On the basis of current safety, the automobile traffic traffic capacity is improved, wherein：Signal controls optimization aim：With motor vehicle throughput
It is up to optimization aim, as shown in formula (1),
In formula：Z is intersection motor vehicle maximum throughput, veh/h；I numbers for intersection fork, and i=1 indicates eastern fork, i=
2 indicate that southern fork, i=3 indicate that western fork, i=4 indicate northern fork；J numbers for traffic direction, and j=1 indicates left-hand rotation, j=2 tables
Show that straight trip, j=3 indicate to turn right, j=4 indicates outlet；μ is intersection discharge coefficient；qijFor the automobile traffic of the forks i j flow directions
Demand, veh/h；
The signal phase phase sequence：Main signal controls for two phase place, respectively thing passage phase and north and south passage phase；Pre- letter
It number is controlled for two phase place, respectively outlet and the current phase of import straight trip and left-hand rotation motor vehicle and left-turn non-motor passage phase
Position；Consider the coordination of main signal and pre-signal, it is desirable that main signal thing passage phase green light start time and two forks of thing
Pre-signal outlet is identical as import straight trip flow direction current phase green light start time, when main signal north and south passage phase green light starts
Quarter is identical as import straight trip flow direction current phase green light start time as the outlet of the north and south forks Liang Ge pre-signal, that is, meets formula (2)-
(9) it requires；
In formula：giFor the forks main signal i green light start time, the relative time being used in a signal period indicates, be 0 to 1 it
Between number；λiFor the forks main signal i green light duration, the relative time being used in a signal period indicates, be 0 to 1 it
Between number；I is green light time interval, s；Green light start time is flowed to for pre-signal i fork j, is used in a signal period
Relative time indicate, be 0 to 1 between number；Green light duration is flowed to for pre-signal i fork j, is used in a signal
Relative time in period indicates, is the number between 0 to 1；
The cycle duration constraint：It is required that main signal is identical as pre-signal cycle duration, and in rational minimum and maximum signal
Within the scope of cycle duration, to ensure that it is line style model to be established model, is indicated using the inverse in period, that is, meet formula (10) and want
It asks；
In formula：ξ is the inverse of signal period duration, s；CmaxAnd CminRespectively minimum and maximum signal period duration, s；
It is described respectively to flow to long green light time constraint：It is required that each long green light time that flows to should meet minimum long green light time requirement, especially answer
Notice that left turn phase long green light time should meet left-hand rotation bicycle crossing signal length demand at pre-signal, that is, meet formula (11)-(12) and want
It asks；
In formula：GiminFor the requirement of the forks main signal i minimum green light duration, s；It is minimum for pre-signal i fork j flow directions
The requirement of green light duration, s；
The saturation degree constraint：It is required that each saturation degree that flows to is limited no more than maximum saturation, that is, meets formula (13)-(14) and want
It asks；
In formula：dmaxIt is limited for maximum saturation；sijSaturation volume rate, veh/h are flowed to for main signal i fork j；For pre-signal i
Fork j flows to saturation volume rate, veh/h.
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109615893A (en) * | 2019-02-01 | 2019-04-12 | 哈尔滨工业大学 | A signal control system and control method for a two-phase conflict-free intersection |
| CN110306391A (en) * | 2019-07-01 | 2019-10-08 | 葛广成 | A kind of method that left turning vehicle passes through crossing |
| CN110838237A (en) * | 2019-12-04 | 2020-02-25 | 吉林大学 | Control method for left-turn-left bus passing at left-forbidden crossroad |
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| CN112289042A (en) * | 2020-10-28 | 2021-01-29 | 南通大学 | Method for designing and controlling signal of non-motor vehicle and motor vehicle left-turning lane at intersection |
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