CN109523808B - Channelized optimization method for left-turn displacement intersection - Google Patents
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Abstract
The invention relates to a channelized optimization method for a left-turn displacement intersection, which comprises the following steps of 1, inputting a parameter QmD and delta, according to the safe clear distance from the left-turn traffic lane changing point to the lane changing completion point being more than or equal to the queuing length of the left-turn vehicles entering the lane, from QmD and delta are used for obtaining the minimum value of the safe clear distance L from the lane changing point of the left-turn vehicle to the lane changing completion point, and the input parameter L1V and vwAccording to the condition that the dissipation time from the left-turn lane changing point to the lane changing completion point is less than or equal to the time from the opposite parking line to the left-turn lane changing completion point of the opposite straight-going vehicle, the dissipation time is L1V and vwObtaining the maximum value of the safe clear distance L from the lane changing point of the left-turn vehicle to the lane changing completion point; and 2, combining the minimum value and the maximum value of the safe clear distance L from the left-turn lane changing point to the lane changing completion point output in the step 1 in the S2 to obtain the value range of the safe clear distance L from the left-turn lane changing point to the lane changing completion point, completing canalization optimization of the left-turn lane shifting intersection, and obtaining the safe clear distance from the left-turn lane changing point to the lane changing completion point of the left-turn lane shifting intersection.
Description
Technical Field
The invention relates to the field of traffic organization, in particular to a channelized optimization method for a left-turn displacement intersection.
Background
The intersection is a bottleneck node of urban road traffic, and a design method of a common plane intersection is mainly used at present, and the safe clear distance design from a left-turn vehicle lane change starting point of the signal control intersection to an intersection stop line is provided with relevant regulations in urban road intersection planning specification GB50647-2011 and urban road intersection design specification CJJ 152 and 2010 in China. The design method for the conventional signalized intersection has a mature technical result at present.
In order to improve the utilization efficiency of time and space resources at the intersection, an unconventional intersection adopting 'shift left turn' is provided. The shift left turn is also called as a Continuous Flow Intersection, and is abbreviated as CFI in English, namely, a Continuous Flow Intersection, which is one of the leading-edge traffic organization means in the world, the basic principle of the traffic organization mode is to arrange straight and left turn in opposite directions in space under the condition of fully utilizing time difference, so that the straight and left turn in opposite directions can be released simultaneously without conflict, namely, the straight and left turn in the direction and the straight and left turn in an opposite lane and the left turn traffic Flow are released simultaneously in the same phase; therefore, the original left-turn phase is shifted to the outside of the intersection, and only one straight-going phase is left in the intersection, so that intersection delay is reduced, and the traffic capacity of the road is improved. The intersection type of shifting left turn improves the traffic capacity of the intersection through dynamic use of the exit lane.
Because the lane that shifts left turn is set up in the outside in relative direction, the corresponding land area that needs to occupy increases, so shift left turn intersection's design is suitable for laying in the suburb and the vehicle moderate degree is gathered and is dispersed, the left turn conflict is great but pedestrian is relatively few place. The left-turn lane for shifting left turn is different from the traditional traffic operation, a guide mark needs to be set to inform a driver of a lane to be selected in advance, the driver is ensured to enter the left-turn lane correctly, and a special marking design is needed to assist the driver in making a decision.
The method for processing left-turning vehicles by the conventional approach mainly comprises two methods, namely, the first method is to change the leftmost straight lane into a left-turning lane; second, the approach lane widens toward the left-turn lane. Both methods adopt the way change of left-turning traffic flow in advance. However, the design methods of the left-turn traffic flow lane-changing point in advance are not suitable for shifting left-turn intersections. At present, the displacement left-turn intersection is practically applied to the Shenzhen color field-Fuhua intersection, but the safety clear distance from the advanced lane change point of the left-turn vehicle at the displacement left-turn intersection to the intersection stop line is mainly taken by experience, and a targeted optimization setting method is not available. Therefore, the prior art lacks a scientific and reasonable setting method for the left-turn traffic stream lane-changing point in advance which is specific to the left-turn intersection.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a channelized optimization method for a left-turn displacement intersection, aiming at the running conflict between a left-turn traffic flow and an opposite-direction straight-going traffic flow at the left-turn displacement intersection, the method ensures that the left-turn traffic flow passes through the intersection with the minimum delay by calculating the safe clear distance from a lane changing point of the left-turn traffic flow to a lane changing completion point, and simultaneously reduces the conflict between the opposite-direction straight-going traffic flow and the left-turn traffic flow, thereby improving the traffic capacity of the intersection on the basis of ensuring the traffic safety.
The invention is realized by the following technical scheme:
a channelized optimization method for a left-turn intersection comprises the following steps,
s1, inputting parameter QmD and delta, according to the constraint that the safe clear distance from the left-turn traffic lane changing point to the lane changing completion point is more than or equal to the queuing length of the left-turn vehicles entering the lane from QmD and delta obtain the minimum value of the safe clear distance L from the lane changing point of the left-turning vehicle to the lane changing completion point, wherein QmThe maximum number of the queued vehicles, d is the head space of the queued vehicles, and delta is the average length of the standard car vehicles;
s2, inputting a parameter L1V and vwAccording to the condition that the dissipation time from the left-turn lane changing point to the lane changing completion point is less than or equal to the time from the opposite parking line to the left-turn lane changing completion point of the opposite straight-going vehicle, the dissipation time is L1V and vwObtaining the maximum value of the safe clear distance L from the lane changing point of the left-turn vehicle to the lane changing completion point, wherein L1The distance from the opposite parking line to the left-turning lane changing completion point for the opposite straight-going vehicle, v is the average running speed of the vehicle in the intersection range, vwDissipating the wave velocity for queuing;
and 2, combining the minimum value and the maximum value of the safe clear distance L from the left-turn lane changing point to the lane changing completion point output in the step 1 in the S2 to obtain the value range of the safe clear distance L from the left-turn lane changing point to the lane changing completion point, completing canalization optimization of the left-turn lane shifting intersection, and obtaining the safe clear distance from the left-turn lane changing point to the lane changing completion point of the left-turn lane shifting intersection.
Preferably, in step 1, the parameters of the left-turn upstream vehicle arrival rate q and the left-turn vehicle passing flow rate S are inputrObtaining the maximum number Q of queued vehicles according to the red light time rm。
Further, said maximum number of vehicles in line QmThe following formula is obtained:
Qm＝r(q-Sr)。
preferably, the minimum value of the safe clear distance L from the left-turn vehicle lane change point to the lane change completion point in step 1 at S1 is obtained by the following formula:
L≥(Qm-1)*d+δ。
preferably, the maximum value of the safe clear distance L from the left-turn lane change point to the lane change completion point in step 1 at S2 is obtained by the following formula:
compared with the prior art, the invention has the following beneficial technical effects:
the invention relates to a channelized optimization method for a shift left-turn intersection, which considers the contradiction between the queuing length constraint and the conflict constraint of left-turn traffic flow and opposite-direction straight traffic flow and inputs a parameter Qm、d、δ、L1V and vwThe method is established in a unified optimization method, the restriction of the queuing length is that the safe clear distance from a left-turn lane changing point to a lane changing completion point is greater than or equal to the queuing length of a left-turn vehicle entering the lane, the displaced left-turn vehicle can be ensured to normally exit the intersection, the restriction of the conflict between the left-turn traffic and the opposite direct traffic is that the dissipation time from the left-turn lane changing point to the lane changing completion point is less than or equal to the dissipation time from the opposite parking line to the left-turn vehicle lane changing completion point of the opposite direct vehicle, so as to ensure that the time from the opposite parking line to the left-turn vehicle lane changing completion point of the opposite direct vehicle is shortBarrier direction straight traffic flow smoothly enters the straight traffic lane without conflict with the shift left turn traffic flow, and parameter Q is inputm、d、δ、L1V and vwAnd obtaining the minimum value and the maximum value of the safe clear distance from the left-turn traffic lane changing point to the lane changing completion point, finishing the channelized optimization of the left-turn shift intersection, and maximizing the traffic capacity of the left-turn shift lane on the basis of ensuring the traffic safety.
Drawings
FIG. 1 is a schematic view of a shifted left turn intersection of the present invention.
FIG. 2 is a schematic diagram of distance parameters for shifting left turn intersections according to the present invention.
In the figure: 1-north entrance left-turn vehicle running track, 2-north entrance straight running vehicle running track, 3-south entrance left-turn vehicle running track, 4-south entrance straight running vehicle running track, 5-north entrance shift left-turn lane, 6-left-turn vehicle lane change point, 7-left-turn vehicle lane change completion point, 8-left-turn vehicle lane change point to lane change completion point safety clear distance L, 9-opposite straight running vehicle stop line, and 10-distance L1 from opposite stop line to left-turn vehicle lane change completion point.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
The invention provides a method for calculating a safe clear distance from a left-turn traffic flow lane change point to a lane change completion point of a shifted left-turn intersection.
The invention relates to a channelized optimization method for a left-turn displacement intersection, which is realized by the following optimization calculation;
on the basis of considering the queuing length and the vehicle emptying, after analyzing the value range and the constraint condition of the optimization parameters, the input parameters of the optimization calculation comprise:
first, QmRepresenting the maximum number of queued vehicles in veh;
second, r, represents red light time in units of s;
thirdly, q represents the arrival rate of the upstream vehicles in the left-turn traffic flow, and the unit is veh/h;
fourth, SrRepresenting the flow rate through a left-turn vehicle in veh/h;
fifthly, d represents the distance between the heads of the queued vehicles, and the unit is m;
sixth, vwThe unit of the wave velocity of queue dissipating is m/s;
seventhly, δ, represents the average length of a standard car vehicle in m;
eighth, v, the average running speed of the vehicle in the range of the intersection is represented, and the unit is km/h;
ninth, L1The unit of the distance between the opposite straight-ahead vehicle and the left-turning lane-changing completion point from the opposite parking line is m;
and tenth, L represents the safe clear distance from the lane changing point of the left-turning vehicle to the lane changing completion point, and the unit is m.
When the input parameters are adopted for calculation, the maximum number of the queued vehicles is obtained according to the formula (1);
Qm＝r(q-Sr) (1)
the constraint of the queuing length requires that the length of the lane from the left-turn vehicle lane changing point to the lane changing completion point is more than or equal to the queuing length of the left-turn vehicle entering the lane, namely the requirement of the formula (2) is met;
L≥(Qm-1)*d+δ (2)
the dissipation time from the lane changing point of the left-turn traffic flow to the lane changing completion point is less than or equal to the time from the opposite stopping line to the lane changing completion point of the left-turn traffic flow, so that the opposite straight traffic flow can be ensured to smoothly drive into the straight traffic lane and not conflict with the shifted left-turn traffic flow. Namely, the requirement of formula (3) is satisfied;
the queuing length of the left-turn vehicles in the left-turn waiting area is less than or equal to the length of the lane from the left-turn traffic lane changing point to the lane changing completion point, so that the shifted left-turn vehicles can be guaranteed to normally exit the intersection, and meanwhile, the time for the opposite straight traffic to reach the left-turn traffic lane changing point is more than or equal to the dissipation time of the shifted left-turn vehicles.
The number of the inlet lanes in the intersection range is at least eight bidirectional lanes, and the left-turn shifting is applied to the east-west direction or the north-south direction. It should be noted that, for the selection of the left-turn shift direction, investigation and research are needed in the early stage, and a certain main road direction is selected as the left-turn shift lane setting direction according to the actual traffic running conflict.
The intersection canalization mode in the embodiment is shown in fig. 1, and the invention is described in detail with reference to fig. 1 and 2.
In the embodiment of the invention, the number of lanes imported from east and west directions in the intersection range is eight bidirectional lanes, the number of lanes imported from north and south directions is nine bidirectional lanes, and the shifting left-turning is applied to the north and south directions. 2 left-turn shifting lanes are arranged in the north-south direction, namely a north entrance left-turn shifting lane 5, wherein the left turn of the north vehicle runs according to a driving track 1 of the north entrance left-turn vehicle, and the straight running of the north vehicle runs according to a driving track 2 of the north entrance straight running vehicle; the south entry shift left-turn lane setting method is the same as the north entry, the left turn of the south vehicle runs according to the south entry left-turn vehicle running track 3, the straight run of the south vehicle runs according to the south entry straight vehicle running track 4, the left-turn lane change point 6, the left-turn lane change completion point 7, the left-turn lane change point to lane change completion point safety clear distance 8, and the opposite straight vehicle stop line 9 and the distance 10 from the opposite stop line to the left-turn lane change completion point of the opposite straight vehicle are shown in fig. 2. The method of the invention is adopted to calculate the safe clear distance from the lane changing point of the left-turn vehicle to the lane changing completion point according to the aim of maximizing the traffic capacity of the left-turn lane after the left-turn lane is set.
As an example, the specific design input parameters are:
taking the red light time r for 90 s;
taking 1600veh/h as the arrival rate q of upstream vehicles in the left-turn traffic flow;
flow rate through a left-turn vehicle, SrTaking 1200 veh/h;
d, taking 7m as the head space of the queued vehicles;
velocity of wave, v, in linewTaking 4.5 m/s;
the average length of the standard car, delta, is taken to be 4 m;
the average running speed v of the vehicle in the range of the intersection is 30 km/h;
distance L from the opposite parking line to the left-turn lane-changing completion point of the opposite straight-ahead vehicle1Take 150 m.
The specific process is as follows:
Qm＝r(q-Sr) (1)
namely, it is
The constraint of the queuing length requires that the length of the lane from the left-turn vehicle lane changing point to the lane changing completion point is more than or equal to the queuing length of the left-turn vehicle entering the lane, namely the requirement of the formula (2) is met;
L≥(Qm-1)*d+δ
i.e. L ≧ (10-1) × 7+4 ═ 67m (2)
The dissipation time of the vehicle from the left-turn lane change point to the lane change completion point satisfies the following constraint:
the dissipation time from the lane changing point of the left-turn traffic flow to the lane changing completion point is less than or equal to the time from the opposite stopping line to the lane changing completion point of the left-turn traffic flow, so that the opposite straight traffic flow can be ensured to smoothly drive into the straight traffic lane and not conflict with the shifted left-turn traffic flow. Namely, the requirement of formula (3) is satisfied;
namely, it is
In summary, the following steps: the value range of the safe clear distance L from the lane changing point of the left-turn vehicle to the lane changing completion point is as follows:
67m≤L≤81m。
the embodiments described above are intended to facilitate the understanding and appreciation of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to this embodiment can be made, and the generic principles defined in this specification may be applied to other embodiments without the use of inventive faculty. Therefore, the present invention is not limited to the embodiments described herein, and those skilled in the art should, in light of the present disclosure, make modifications and alterations without departing from the scope of the present invention.
Claims (1)
1. A channeling optimization method for a left-turn intersection is characterized by comprising the following steps,
step 1, inputting parameters of left-turn traffic flow upstream vehicle arrival rate q and left-turn vehicle passing flow rate SrObtaining the maximum number Q of queued vehicles according to the red light time rm(ii) a Calculating the minimum value and the maximum value of the safe clear distance L from the lane changing point of the left-turn vehicle to the lane changing completion point; maximum number of vehicles in line QmThe following formula is obtained: qm＝r(q-Sr)；
S1, inputting parameter QmD and delta, according to the constraint that the safe clear distance from the left-turn traffic lane changing point to the lane changing completion point is more than or equal to the queuing length of the left-turn vehicles entering the corresponding lane from QmD and delta obtain the minimum value of the safe clear distance L from the lane changing point of the left-turning vehicle to the lane changing completion point, wherein QmThe maximum number of the queued vehicles, d is the head space of the queued vehicles, and delta is the average length of the standard car vehicles;
the left-turn traffic flow transformerThe minimum value of the safe clear distance L from the lane point to the lane change completion point is obtained by the following formula: l is not less than (Q)m-1)*d+δ；
S2, inputting a parameter L1V and vwAccording to the condition that the dissipation time from the left-turn lane changing point to the lane changing completion point is less than or equal to the time from the opposite parking line to the left-turn lane changing completion point of the opposite straight-going vehicle, the dissipation time is L1V and vwObtaining the maximum value of the safe clear distance L from the lane changing point of the left-turn vehicle to the lane changing completion point, wherein L1The distance from the opposite parking line to the left-turning lane changing completion point for the opposite straight-going vehicle, v is the average running speed of the vehicle in the intersection range, vwDissipating the wave velocity for queuing; the maximum value of the safe clear distance L from the left-turn vehicle lane changing point to the lane changing completion point is obtained by the following formula:
and 2, combining the minimum value and the maximum value of the safe clear distance L from the left-turn lane changing point to the lane changing completion point output in the step 1 in the S2 to obtain the value range of the safe clear distance L from the left-turn lane changing point to the lane changing completion point, completing canalization optimization of the left-turn lane shifting intersection, and obtaining the safe clear distance from the left-turn lane changing point to the lane changing completion point of the left-turn lane shifting intersection.
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| CN111292542B (en) * | 2020-02-24 | 2021-08-31 | 深圳市综合交通设计研究院有限公司 | Signal lamp system and control method thereof |
| CN112085955B (en) * | 2020-09-04 | 2021-07-13 | 东南大学 | Channelized design optimization method for continuous flow intersection |
| CN113362623B (en) * | 2021-06-04 | 2022-03-01 | 哈尔滨工业大学 | Continuous flow intersection left-turn non-motor vehicle traffic organization system and signal control method |
| CN113516855B (en) * | 2021-06-07 | 2022-06-10 | 东南大学 | Channelized design optimization method for parallel flow intersection |
| CN113947898B (en) * | 2021-09-29 | 2023-03-21 | 北京建筑大学 | Optimization method for displacement left turn at intersection |
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