CN105133450A - Design method for road crossing turn-around region provided with center isolation guardrail - Google Patents
Design method for road crossing turn-around region provided with center isolation guardrail Download PDFInfo
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- CN105133450A CN105133450A CN201510579002.5A CN201510579002A CN105133450A CN 105133450 A CN105133450 A CN 105133450A CN 201510579002 A CN201510579002 A CN 201510579002A CN 105133450 A CN105133450 A CN 105133450A
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Abstract
The invention discloses a design method for a road crossing turn-around region provided with a center isolation guardrail. The method comprises the following steps that (A) firstly, a passing capability calculation model of a left turning and a turn-around public lane is determined; (B) then, the position of a turn-around region of the left turning and the turn-around public lane is determined. The method has the advantages that through analyzing the mutual influencing mechanism of the left turning and turn-around traffic flow under different conditions, the passing capability calculation model of the left turning and the turn-around public lane is built; a turn-around region best position calculation method of the turn-around region is built by using the maximum passing capability as the target; the problem of blindness of an existing turn-around region setting is solved; the scientificity and the practicability of the turn-around region setting are improved. The design method can be used for current road crossing turn-around region optimization transformation; important guidance significance is realized for the design and building of a proposed road crossing.
Description
Technical field
The present invention relates to traffic programme and design field, be specifically related to a kind of intersection tune region design method that central isolation guardrail is set.
Background technology
The intersection arranging central isolation guardrail refers to that the section of road intersection and the central authorities in crossing inlet road are provided with isolation guardrail.Effective green time refer to green light display deduct lost time.Left-hand rotation and tune shared-lane capacity refer under current road, traffic, control and ambient conditions, the maximum number of vehicles that this Shared Lane passed through in a hour.Vehicle road occupying length refers to the space length of the safe spacing between length and front and back two car comprising vehicle self.
At present, the optimum position in urban road intersection tune region still lacks reasonable, feasible method, be all that traffic administration personnel are rule of thumb arranged, cause left turn traffic and u-turn car flow mutually to disturb obviously in current process, cause track time resource waste and traffic capacity decline.
Through inventor's long term investigation and research, by analyzing and the u-turn car flow mechanism that influences each other at different conditions, establish the traffic capacity computation model of left-hand rotation and tune Shared Lane, and be the optimal setting positions that target determines tune region with Maximum Traffic Capacity, make to influence each other between left turn traffic and u-turn car flow minimum, the utilization rate of track resource is the highest.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, provide a kind of intersection tune region design method that central isolation guardrail is set.
The present invention includes following steps:
A) traffic capacity computation model of left-hand rotation and tune Shared Lane is first set up, specifically:
A) traffic stream characteristics of left-hand rotation and tune Shared Lane is first determined
Here traffic stream characteristics comprises three parameters: vehicle road occupying length l when vehicle arriving rate d, tune ratio lambda of turning left, intersection parking are queued up in the unit interval
0;
Turn left and tune Shared Lane traffic stream characteristics defining method, comprise following two kinds:
1) on-site inspection, obtains the data of the traffic stream characteristics calculating left-hand rotation and tune Shared Lane
This is mainly optimized for built intersection, needs the data obtained to comprise: vehicle number, the intersection signal timing scheme of left-hand rotation peak period and the arrival of tune Shared Lane and the left-hand rotation passed through and tune;
Utilize and investigate the road occupying length l that the data obtained calculate each car when left-hand rotation and the left-hand rotation car of reversing end for end on Shared Lane and tune car ratio lambda, vehicle arriving rate d, intersection parking are queued up
0;
2) analyses and prediction, directly determine to turn left and tune Shared Lane traffic stream characteristics
This, mainly for planning to build intersection, takes into full account periphery transport need in the planning stage, the road occupying length l of each car when showing that the left-hand rotation of this intersection and the left-hand rotation car of reversing end for end on Shared Lane and tune car ratio lambda, vehicle arriving rate d, intersection parking are queued up
0;
B) design parameters of intersection is then determined;
Here intersection design parameters comprises: the distance L of subtend import track stop line and this import stop line
1, each import in adjacent outlets road width H, intersection keeps straight on, turns left, the design speed V of tune
directly establish, V
left if, V
tune is established, intersection this import canalization segment length L
2, turn left treat row section length L
3;
The acquisition methods of the design parameters of intersection, comprises following two kinds:
1) on-site inspection, obtains the data calculating intersection design parameters
Measure the distance L of subtend import track stop line and this import stop line on the spot
1, adjacent outlets number of track-lines and lane width H, intersection this import canalization segment length L
3, by the tachymeter measuring vehicle speed by intersection;
2) consult intersection design scheme, directly obtain intersection design parameters
C) intersection signal timing scheme is determined;
The acquisition methods of intersection signal timing scheme, comprises following two kinds:
1) on-site inspection, record wagon flow clearance order, each stage duration, signal period duration c;
2) consult intersection design scheme, directly obtain the detailed singnal configuration design scheme in intersection;
D) traffic capacity computation model of this left-hand rotation and tune Shared Lane is finally set up
The process setting up the traffic capacity computation model of this left-hand rotation and tune Shared Lane comprises:
1) first analyze and the reason of tune Shared Lane loss of time
Analyze the process of left-hand rotation and the tune Shared Lane reason loss of time: because tune region is arranged in canalization section, when reverse end for end car enter Shared Lane at first and reverse end for end region place parking waiting time, its follow-up left turning vehicle just can only be followed and stopped and cannot arrive stop line (comprising the front end stop line arranging left turn waiting zone), so will be formed one " no-man's-land " between tune region and stop line, when left-hand rotation and tune green light open bright after, left-hand rotation car starts after tune car will be waited to sail out of from the position away from stop line again, and the wait tune car of the car that turns left sails out of and by the time of " no-man's-land " is exactly the first kind lost time of Shared Lane, the second situation, in the signal phase that no left turn allows tune, when the queue length of left-hand rotation car exceedes tune region, will stop the normal pass of tune car, make residue green time become sky and put, this is the Equations of The Second Kind lost time of Shared Lane, to the reason key factor of Shared Lane loss of time be caused to be two large classes, that is: reversing end for end car stops that the loss of time that left-hand rotation car brings and left-hand rotation car stop the loss of time that tune car brings,
2) computation model loss of time in two class situations is secondly set up
Set up in two class situations the loss of time computation model process: first analyze tune car and stop the loss of time that left-hand rotation car brings, equal last straightgoing vehicle on last stage by the clean up time of tune mouth, vehicle launch lost time, the most last left-hand rotation car being stopped by tune car by the time sum of its " no-man's-land "; Secondly analyze left-hand rotation car and stop the loss of time that tune car brings, equal the total duration of this signal phase deduct from this stage left-hand rotation red light open bright to queue up to left-hand rotation car and block the duration that tune mouth experiences;
3) the total losses Time Calculation model of left-hand rotation and tune Shared Lane is then determined
Calculate and the process of tune Shared Lane total losses time: tune car stops and left-hand rotation car brings the loss of time and left-hand rotation car to stop tune car brings the loss of time two large class situation all to comprise a variety of situation, each situation has probability and the lost time of oneself correspondence, and the mathematic expectaion of total losses time is exactly lost time under all scenario be multiplied by its probability of happening sum;
4) traffic capacity computation model of left-hand rotation and tune Shared Lane is finally set up
Here set up and the process of traffic capacity computation model of tune Shared Lane: deduct the total losses time with unit transit time and obtain effective transit time, with the transit time of effective transit time divided by unit norm car, must turn left and reverse end for end the traffic capacity of Shared Lane;
B) the tune regional location of this left-hand rotation and tune Shared Lane is determined again, specifically:
A) traffic capacity of this left-hand rotation and tune Shared Lane under different tune regional location is first solved
When turning left and tune lane traffic characteristic, intersection design parameters are known, allow tune regional location 0 to L
2between value, draw the traffic capacity of this left-hand rotation and tune Shared Lane under different tune regional location;
B) the tune regional location of this left-hand rotation and tune Shared Lane is determined again
The traffic capacity of this left-hand rotation and tune Shared Lane under the difference tune regional location that utilization draws, draw the traffic capacity of left-hand rotation and tune Shared Lane and the corresponding change curve of tune regional location, that position making Maximum Traffic Capacity is exactly optimum position.
The present invention is calculating and is reversing end for end in the process of shared-lane capacity, according to traffic stream characteristics, the intersection design parameters in this track, and in conjunction with intersection actual motion characteristic, carry out foundation and the simplification of model, and be the optimal setting positions that target determines tune region with Maximum Traffic Capacity, make to influence each other between left turn traffic and u-turn car flow minimum, the utilization rate of track resource is the highest.
Beneficial effect of the present invention:
1) the present invention is when determining tune region optimal setting positions, with the traffic stream characteristics in track, intersection design parameters for foundation, and fully taken into account contingent conflict type in the middle of actual motion, Modling model, make the setting in tune region more accurately, rationally;
2) the present invention continues to use former vehicle arriving rate model and arranges form with the intersection tune region arranging central isolation guardrail, the Position Design method in pioneering tune region, intersection size, design speed and left-hand rotation tune demand are combined, making the traffic capacity design formulas set up describe tune region setting position more accurately to turning left and reversing end for end the impact of Shared Lane operational efficiency, can be better Urban Traffic Planning and management service.
Accompanying drawing explanation
Fig. 1 be the present invention the At-grade intersection schematic diagram that is suitable for;
Fig. 2 is signal time distributing conception schematic diagram of the present invention;
Fig. 3 is that tune car stops the intersection queuing schematic diagram that left-hand rotation car is current;
Fig. 4 is that left-hand rotation car stops the intersection queuing schematic diagram that tune car is current;
Fig. 5 is the flow chart of the inventive method.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described.
As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4 and Fig. 5, the present embodiment step comprises: first set up and tune Shared Lane traffic capacity computation model, determine the tune regional location of this left-hand rotation and tune Shared Lane again.
A) in the process of traffic capacity computation model determining left-hand rotation and tune Shared Lane:
A) first to determine to turn left and the traffic stream characteristics of tune Shared Lane, namely comprise three parameters: turn left and left-hand rotation car on tune Shared Lane and tune car ratio lambda, vehicle arriving rate d, vehicle road occupying length l when intersection parking is queued up
0;
B) then determine the design parameters of intersection, comprising: the distance L of subtend import track stop line and this import stop line as shown in fig. 1
1, adjacent outlets road width H, intersection this import canalization segment length L
2, turn left treat row section length L
3, each import in intersection keeps straight on, turns left, the design speed V of tune
directly establish, V
a left side is established, V
tune is established, represent the tune region setting position that will solve here with L, represent tune mouth width with h, get 6m here;
C) determine intersection signal timing scheme, here as shown in Figure 2, order tune signal opens bright, stage 3 in the stage 2 to be terminated, and signal period duration is c, each stage duration is followed successively by g
1, g
2, g
3, g
4;
D) finally determine the traffic capacity computation model of this left-hand rotation and tune Shared Lane, process comprises:
1) reason causing turning left and reverse end for end the Shared Lane loss of time is first analyzed:
Analyze the process of left-hand rotation and the tune Shared Lane reason loss of time: as shown in Figure 3, because tune region is arranged in canalization section, when reverse end for end car enter Shared Lane at first and reverse end for end region place parking waiting time, its follow-up left turning vehicle just can only be followed and stopped and cannot arrive stop line (comprising the front end stop line arranging left turn waiting zone), so will be formed one " no-man's-land " between tune region and stop line, when left-hand rotation and tune green light open bright after, left-hand rotation car starts after tune car will be waited to sail out of from the position away from stop line again, and the wait tune car of the car that turns left sails out of and by the time of " no-man's-land " is exactly the first kind lost time of Shared Lane, the second situation, as shown in Figure 4, in the signal phase 3 that no left turn allows tune, when the queue length of left-hand rotation car exceedes tune region, will stop the normal pass of tune car, make residue green time become sky and put, this is the Equations of The Second Kind lost time of Shared Lane, to the reason key factor of Shared Lane loss of time be caused to be two large classes, that is: reversing end for end car stops that the loss of time that left-hand rotation car brings and left-hand rotation car stop the loss of time that tune car brings,
2) computation model loss of time in all kinds of situation is secondly set up
Set up in all kinds of situation the loss of time computation model process:
21) first analyze the loss of time that tune car stop left-hand rotation car brings, equal: last is kept straight on by the clean up time of tune mouth on last stage
vehicle launch lost time, generally get 2s, the most last the left-hand rotation car stopped by tune car is by the time of its " no-man's-land "
(note: n is L in the period in stage 2
3left-hand rotation queuing vehicle number on this segment distance of+L) sum, namely lost time is
Secondly 22) analyze left-hand rotation car and stop the loss of time that tune car brings, the total duration equaling the stage 3 deduct from this stage left-hand rotation red light open bright to queue up to left-hand rotation car and block the duration that tune mouth experiences;
Suppose that total duration in stage 3 is g
3, t (0<t≤g
3) interior arrival second
left-hand rotation car, lost time is now
Y
2t＝g
3-t
3) the total losses Time Calculation model of left-hand rotation and tune Shared Lane is then determined
31) first determine that tune car stops the computation model loss of time that left-hand rotation car brings
Before stage 2 starts, L
3the left turning vehicle number n span that+L section is queued up is 0 ~ x ' (x ' be
the maximum value of business, i.e. L
3the maximum bearing capacity of+L section), then the probability calculation formula in such situation is:
Tune car stops that the computation model loss of time that left-hand rotation car brings is
32) secondly determine that left-hand rotation car stops the computation model loss of time that tune car brings
For the period in stage 3, ask interior arrival t second
the probability of left-hand rotation car: according to assumed condition, vehicle is uniformly distributed, then k left-hand rotation car is corresponding
tune car, now problem is converted into:
Ask in t second and arrive vehicle fleet and be
probability
according to current achievement in research, vehicle arrives obeys Poisson distribution, and known t second, the interior vehicle fleet that arrives was
probability be
Wherein m=dt, represents the average vehicle number arrived in counting interval t;
Then left-hand rotation car stops that the computation model loss of time that tune car brings is
33) the total losses Time Calculation model of left-hand rotation and tune Shared Lane is then determined
Turn left and total losses time of tune Shared Lane, be namely two class situation lower lost times add and, then total losses Time Calculation model is
Y＝Y
1+Y
2
4) traffic capacity computation model of left-hand rotation and tune Shared Lane is finally determined
Obtain effective transit time the lost time deducted in unit transit time with unit transit time, with the transit time of effective transit time divided by single unit vehicle, both obtain the traffic capacity in track.
Wherein t
saturatedrepresent the saturation headway of continuous wagon flow, i.e. the transit time of single unit vehicle here.
B) the tune regional location of this left-hand rotation and tune Shared Lane is determined again
A) traffic capacity of this left-hand rotation and tune Shared Lane under different tune regional location is first solved
When turning left and tune lane traffic characteristic, intersection design parameters are known, allow tune regional location 0 to L
2between value, draw the traffic capacity of this left-hand rotation and tune Shared Lane under different tune regional location;
B) the tune regional location of this left-hand rotation and tune Shared Lane is determined again
The traffic capacity of this left-hand rotation and tune Shared Lane under the difference tune regional location that utilization draws, draw the traffic capacity of left-hand rotation and tune Shared Lane and the corresponding change curve of tune regional location, that position making Maximum Traffic Capacity is exactly optimum position.
Present embodiments provide the traffic capacity design formulas of a kind of left-hand rotation and tune Shared Lane, and solved the computational methods of the intersection tune optimum position, region that central isolation guardrail is set, overcome the blindness that tune region is at present arranged, improve path resource utilization rate, there is higher use value.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 also should be considered as protection scope of the present invention.
Claims (5)
1. an intersection tune region design method for central isolation guardrail is set, it is characterized in that the concrete steps of the method are:
Steps A) first set up turn left and tune Shared Lane traffic capacity computation model;
Step B) determine again this left-hand rotation and tune Shared Lane tune regional location;
Described steps A) specifically comprise the steps:
A) traffic stream characteristics of left-hand rotation and tune Shared Lane is first determined;
B) design parameters of intersection is then determined;
C) intersection signal timing scheme is determined again;
D) traffic capacity computation model of this left-hand rotation and tune Shared Lane is finally set up, specifically:
1) reason causing turning left and reverse end for end the Shared Lane loss of time is first analyzed;
2) computation model lost time in all kinds of situation is secondly set up;
3) the total losses Time Calculation model of left-hand rotation and tune Shared Lane is then determined;
4) traffic capacity computation model of left-hand rotation and tune Shared Lane is finally set up;
Described step B) specifically comprise the steps:
A) traffic capacity of this left-hand rotation and tune Shared Lane under different tune regional location is first solved;
B) the tune regional location of this left-hand rotation and tune Shared Lane is determined again.
2. intersection tune region design method according to claim 1, is characterized in that: described steps A) in:
Step a) needs the data obtained to comprise: vehicle arriving rate in the unit interval
d, left-hand rotation tune ratio
λ, intersection parking vehicle road occupying length when queuing up
l 0;
Step b) needs the data obtained to comprise: the distance of subtend entrance driveway stop line and this import stop line
l 1, adjacent outlets road width
h, keep straight in intersection, turn left, the design speed of tune
v directly establish,
v a left side is established,
v tune is established, this import canalization segment length of intersection
l 2, turn left treat row section length
l 3;
Step c) needs the data obtained to comprise: wagon flow clearance order, each signal phase duration
g 1,
g 2,
g 3,
g 4, signal period duration
c.
3. intersection according to claim 1 tune region design method, is characterized in that: described steps A) step d) specifically comprise:
1) first analyze and the reason of tune Shared Lane loss of time;
Analyze the process of left-hand rotation and the tune Shared Lane reason loss of time: because tune region is arranged in canalization section, when reverse end for end car enter Shared Lane at first and reverse end for end region place parking waiting time, its follow-up left turning vehicle just can only be followed and stopped and cannot arrive stop line, so will be formed one " no-man's-land " between tune region and stop line, when left-hand rotation and tune green light open bright after, left-hand rotation car starts after tune car will be waited to sail out of from the position away from stop line again, and the wait tune car of the car that turns left sails out of and by the time of " no-man's-land " is exactly the first kind lost time of Shared Lane, the second situation, in the 3rd signal phase that no left turn allows tune, when the queue length of left-hand rotation car exceedes tune region, will stop the normal pass of tune car, make residue green time become sky and put, this is the Equations of The Second Kind lost time of Shared Lane, to the reason key factor of Shared Lane loss of time be caused to be two large classes, that is: reversing end for end car stops that the loss of time that left-hand rotation car brings and left-hand rotation car stop the loss of time that tune car brings,
2) computation model loss of time in two class situations is secondly set up;
Set up in two class situations the loss of time computation model process: first analyze tune car and stop the loss of time that left-hand rotation car brings, equal last straightgoing vehicle on last stage by the clean up time of tune mouth, vehicle launch lost time, the most last left-hand rotation car being stopped by tune car by the time sum of its " no-man's-land "; Secondly analyze left-hand rotation car and stop the loss of time that tune car brings, equal the total duration of this signal phase deduct from this stage left-hand rotation red light open bright to queue up to left-hand rotation car and block the duration that tune mouth experiences;
3) the total losses Time Calculation model of left-hand rotation and tune Shared Lane is then determined;
Calculate and the process of tune Shared Lane total losses time: tune car stops and left-hand rotation car brings the loss of time and left-hand rotation car to stop tune car brings the loss of time two large class situation all to comprise a variety of situation, each situation has probability and the lost time of oneself correspondence, and the mathematic expectaion of total losses time is exactly lost time under all scenario be multiplied by its probability of happening sum;
4) traffic capacity computation model of left-hand rotation and tune Shared Lane is finally set up;
Here set up and the process of traffic capacity computation model of tune Shared Lane: deduct the total losses time with unit transit time and obtain effective transit time, with the transit time of effective transit time divided by unit norm car, must turn left and reverse end for end the traffic capacity of Shared Lane.
4. intersection tune region design method according to claim 1, it is characterized in that: described step B) in step a) specifically: when turning left and tune lane traffic characteristic, intersection design parameters are known, allow tune regional location arrive 0
l 2between value, draw the traffic capacity of this left-hand rotation and tune Shared Lane under different tune regional location.
5. intersection tune region design method according to claim 1, it is characterized in that: described step B) in step b) specifically: utilize draw difference tune regional location under this left-hand rotation and tune Shared Lane the traffic capacity, draw the traffic capacity of left-hand rotation and tune Shared Lane and the corresponding change curve of tune regional location, that position making Maximum Traffic Capacity is exactly optimal setting positions.
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| CN201510579002.5A CN105133450B (en) | 2015-09-12 | 2015-09-12 | A kind of intersection tune region design method that central authorities' isolation guardrail is set |
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| CN109385940A (en) * | 2018-10-26 | 2019-02-26 | 淮阴工学院 | Left-hand rotation based on traffic shock wave theory turns around mouth away from the design method for stopping line length |
| CN111540197A (en) * | 2020-04-17 | 2020-08-14 | 浙江大华技术股份有限公司 | Lane function division method and device, electronic equipment and storage medium |
| CN111681417A (en) * | 2020-05-14 | 2020-09-18 | 北京百度网讯科技有限公司 | Traffic intersection canalization adjusting method and device |
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| CN105825674B (en) * | 2016-05-16 | 2018-06-26 | 浙江大学 | It is a kind of to consider the straight right lane traffic capacity computational methods that lag is let pass of turning right |
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| CN106781555A (en) * | 2016-12-28 | 2017-05-31 | 山东理工大学 | A kind of signalized intersections u-turn region design method that double left turn lanes are set |
| CN106781555B (en) * | 2016-12-28 | 2017-11-03 | 山东理工大学 | A kind of signalized intersections for setting double left turn lanes reverse end for end region design method |
| WO2019075859A1 (en) * | 2017-10-17 | 2019-04-25 | 大连理工大学 | Signal intersection turn-around opening position selection method affected by traffic flow composition |
| CN107798868A (en) * | 2017-10-17 | 2018-03-13 | 大连理工大学 | A kind of signalized intersections u-turn opening bit selecting method that traffic flow composition influences |
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| CN111540197A (en) * | 2020-04-17 | 2020-08-14 | 浙江大华技术股份有限公司 | Lane function division method and device, electronic equipment and storage medium |
| CN111540197B (en) * | 2020-04-17 | 2022-03-18 | 浙江大华技术股份有限公司 | Lane function division method and device, electronic equipment and storage medium |
| CN111681417A (en) * | 2020-05-14 | 2020-09-18 | 北京百度网讯科技有限公司 | Traffic intersection canalization adjusting method and device |
| CN111681417B (en) * | 2020-05-14 | 2022-01-25 | 阿波罗智联(北京)科技有限公司 | Traffic intersection canalization adjusting method and device |
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| CN118334867A (en) * | 2024-06-13 | 2024-07-12 | 腾讯烟台新工科研究院 | Method for evaluating influence of physical isolation fence in middle of highway on traffic flow |
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