CN112767699B - Method for judging setting conditions of fixed straight-running CAV (computer aided design) special entrance lane at signalized intersection - Google Patents
Method for judging setting conditions of fixed straight-running CAV (computer aided design) special entrance lane at signalized intersection Download PDFInfo
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Abstract
The invention discloses a method for judging setting conditions of a fixed straight-going CAV special entrance lane of a signal intersection. The method is suitable for a timing control signal intersection with the number of straight-going lanes of the entrance lane being not less than 2, the driving direction to be set being 6: 00-22: 00, the hourly traffic volume of all entrance lanes being not less than 600 standard cars/hour and the difference between the maximum value and the minimum value being not more than 150 standard cars/hour. According to different situations of the number of straight-going lanes of the entrance lane and the traffic volume, the method proposes the minimum CAV proportion that the driving direction of the fixed straight-going CAV special entrance lane needs to be satisfied. The invention provides a quantitative method for judging setting conditions of a fixed straight-going CAV special entrance lane of a signal intersection, which is used as a judgment standard to guide the setting of the fixed straight-going CAV special entrance lane of the signal intersection, is beneficial to improving the traffic efficiency of the mixed traffic flow of the signal intersection, reducing the delay and the oil consumption, and provides a method support for the traffic organization optimization of the entrance lane of the signal intersection in the mixed traffic flow environment.
Description
Technical Field
The invention relates to the field of urban road traffic organization control, in particular to a method for judging the setting conditions of a fixed straight-going CAV (vehicle Access Tunnel) special entrance lane at a signalized intersection.
Background
Under the background of the cooperative development of the vehicle and the road, the scientific operation organization of the mixed traffic flow in the internet environment becomes one of the hot problems of the current traffic field research. Research shows that in mixed traffic flow, the speed and acceleration of each Vehicle in a fleet composed of CAVs (Connected and Autonomous vehicles) are consistent, the following distance between vehicles is smaller and relatively uniform, and the mixed traffic flow is beneficial to improving the road resource utilization rate and the Vehicle traffic capacity. The signalized intersection is a key node influencing the operation of a traffic system, the straight-going inlet lane is the most traffic flow in each inlet lane, and the research on how to set the straight-going CAV special inlet lane for the signalized intersection is of great significance for improving the traffic capacity of the intersection and reducing the vehicle delay and the fuel consumption in a mixed traffic flow environment.
In the past research, some scholars at home and abroad research the influence of setting a CAV special lane on improving the road traffic capacity and relieving traffic jam based on the factors such as traffic volume, CAV proportion and the like, and find that setting the CAV special lane when the CAV proportion is low aggravates the jam of a common lane, and when the CAV proportion is more than 50%, setting the CAV special lane can reduce the CAV degradation probability, improve the efficiency of mixed traffic flow and relieve traffic jam. However, most of the road environments of the existing researches are expressways, the researches under urban working conditions are blank, and relevant setting standards are not clear, so that quantitative setting conditions need to be researched. Due to the traffic complexity of the urban signal intersection, compared with the arrangement of a straight-going CAV special lane, the arrangement of the straight-going CAV special entrance lane is more favorable for realizing the flexible organization of the mixed traffic flow, so that a quantitative judgment method needs to be provided according to the arrangement conditions of the straight-going CAV special entrance lane under the urban working condition so as to improve the passing efficiency of the whole mixed traffic flow and reduce delay and oil consumption. The most basic control mode of the signalized intersection is timing control of a single intersection, and the simplest setting form of the straight-running CAV special entrance lane is fixed, so that the fixed straight-running CAV special entrance lane is firstly unfolded in the research of the method for judging the setting conditions of the straight-running CAV special entrance lane of the signalized intersection under the urban working condition, thereby providing theoretical support for optimizing the traffic organization of the signalized intersection entrance lane under the mixed traffic flow environment.
Disclosure of Invention
In view of the defect that the conventional research has the defect that the setting standard of a straight-running CAV (vehicle access lane) special entrance lane at an urban signalized intersection is not clear, the invention aims to solve the technical problem of defining the quantitative setting standard and provides a method for judging the setting condition of the fixed straight-running CAV special entrance lane at the signalized intersection.
The invention is realized by adopting the following technical scheme, which is described as follows:
1. a method for judging the setting condition of a fixed straight-running CAV special entrance lane at a signalized intersection is characterized in that the driving direction of the fixed straight-running CAV special entrance lane to be set needs to meet the basic road condition that the number of straight-running lanes at the entrance lane is not less than 2; the traffic volume does not fluctuate obviously along with time, namely the difference between the maximum value and the minimum value of the sum of the traffic volumes of all entrance lane hours in the direction of 6:00-22:00 in the 25 nd Tuesday survey of illegal holidays in one year is not more than 150 standard cars/hour; the sum of all the hourly traffic volumes of the entrance roads is recorded asQTaking the minimum value and recording asQ min Recording the minimum value of the ratio of the sum of the CAV quantity of all the entrance roads in the direction of each hour from 6:00 to 22:00 to the sum of the hourly traffic volume of all the entrance roads as the lowest CAV proportion, and setting the following judgment conditions for setting the fixed straight-running CAV special entrance road at the signalized intersection as follows:
when the number of straight lanes at the entrance lane is 2,Q min Greater than or equal to 600 standard cars/hour and less than 2400 standard carsThe minimum CAV ratio is not less than-0.0001 in per hourQ min +0.7740, meeting the requirement of setting fixed straight CAV special inlet channel;
when the number of straight lanes at the entrance lane is 2,Q min When the standard car/hour is larger than or equal to 2400 standard cars and the lowest CAV proportion is not less than 0.50, the requirement of setting a fixed straight-running CAV special entrance lane is met;
when the number of the straight lanes of the inlet lane is not less than 3,Q min More than or equal to 600 standard cars/hour and less than 2100 standard cars/hour, the lowest CAV proportion is not less than-0.0001Q min +0.5446, meeting the requirement of setting fixed straight CAV special inlet channel;
when the number of the straight lanes of the inlet lane is not less than 3,Q min When the ratio is larger than or equal to 2100 standard cars/hour and the lowest CAV is not less than 0.25, the requirement of setting a fixed straight-running CAV special entrance lane is met.
2. The method for judging the setting conditions of the special crossroad for the fixed straight-running CAV at the signalized intersection according to claim 1, wherein the data survey requirement of the proportion of the sum of hourly traffic volumes of all the crossroads to the lowest CAV is that two nonadjacent quarter clocks are selected as survey time periods every hour from 6:00 to 22:00, an interval of 15 minutes is required between every two survey time periods, and the traffic volume obtained by the survey every hour is converted into hourly traffic volume.
Compared with the prior art, the invention has the beneficial effects that:
1. the method for judging the setting conditions of the fixed straight-running CAV special entrance lane at the signalized intersection comprehensively considers the influence of the traffic volume and the CAV proportion on the setting benefits of the CAV special entrance lane, provides a quantitative fixed straight-running CAV special entrance lane setting standard, and is suitable for timing control signalized intersections under various traffic running conditions;
2. the method for judging the set conditions of the fixed straight-running CAV special entrance lane at the signalized intersection considers the driving characteristics of different types of vehicles (including Internet-connected automatic driving vehicles, Internet-connected manual driving vehicles, non-Internet-connected automatic driving vehicles and non-Internet-connected manual driving vehicles) at the entrance lane of the signalized intersection, and can be applied to traffic organization and control of the signalized intersection in a mixed traffic flow environment.
Drawings
FIG. 1 is a general flow chart of a method for determining the conditions for setting a fixed straight-running CAV-dedicated entrance lane at a signalized intersection according to the present invention;
FIG. 2 is a schematic diagram of the layout of a fixed straight-running CAV special entrance lane when the number of straight-running lanes of the entrance lane is 2;
FIG. 3 is a schematic diagram of the layout of fixed straight-running CAV special entrance lanes when the number of straight-running lanes of the entrance lane is not less than 3;
FIG. 4 is an application diagram of the practical layout of the fixed straight-going CAV special entrance lane at the signalized intersection.
Detailed Description
The detailed description of the present invention and the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The fixed straight-going CAV special inlet lane is designed to adopt the same straight-going CAV special inlet lane arrangement scheme at each time interval of one day in the direction of the signalized intersection, meets the requirements of the fixed straight-going CAV special inlet lane for flow and the lowest CAV proportion at each time interval, and is suitable for signalized intersections with small flow difference and timing type signal control all day.
The method for judging the setting conditions of the fixed straight-running CAV special entrance lane at the signalized intersection considers the influence of the CAV proportion and the traffic volume on the traffic operation efficiency of the intersection, and is suitable for setting the fixed straight-running CAV special entrance lane at the signalized intersection under timing type signal control under various traffic conditions.
Referring to fig. 1, the method for determining the setting condition of the fixed straight-running CAV dedicated entrance lane at the signalized intersection according to the present invention comprises the following steps, which are discussed in detail below:
the ratio of the sum of all the entrance lane hourly traffic volumes and the CAV of the signalized intersection of the special entrance lane for the fixed straight-running CAV is investigated, and the maximum value and the minimum value of the sum of all the entrance lane hourly traffic volumes of the entrance lane to be set in the driving direction are required to be different from each other by not less than 2 and 6:00-22:00 and are not less than 150 standard cars/hour and not less than 600 standard cars/hour. The data survey requirement of the ratio of the sum of all entrance lane hourly traffic volumes to the CAV is that two nonadjacent quarter clocks are selected as survey time periods in 6:00-22:00 per hour, the interval between every two survey time periods is 15 minutes, vehicles of different types and vehicle types need to be distinguished when the survey is needed, and the traffic volume obtained by the survey per hour is converted into the hourly traffic volume.
And setting and judging according to the number of straight-going lanes of the entrance lane at the intersection of the special entrance lane for the fixed straight-going CAV, the minimum value of the sum of hourly traffic volumes of all the entrance lanes and the CAV ratio. Dividing the number of the straight lanes of the entrance lane into two types of the number of the straight lanes of the entrance lane equal to 2 and not less than 3, further subdividing the number of the straight lanes of the entrance lane into 4 cases according to the minimum value of the sum of the hourly traffic volumes of all the entrance lanes, and correspondingly comparing respective quantitative setting conditions to obtain a judgment conclusion as follows:
1. when the number of straight lanes at the entrance lane is 2
（1）Q min More than or equal to 600 standard cars/hour and less than 2100 standard cars/hour, the lowest CAV proportion is not less than-0.0001Q min +0.5446, meeting the requirement of setting fixed straight CAV special inlet channel;
（2）Q min when the ratio is not less than 2100 standard cars/hour and the lowest CAV ratio is not less than 0.25, the requirement of setting a fixed straight-running CAV special entrance lane is met;
2. when the number of the straight lanes of the entrance lane is not less than 3
（1）Q min Greater than or equal to 600 standard cars/hour and less than 2400 standard cars/hourThe lowest CAV proportion is not less than-0.0001Q min +0.7740, meeting the requirement of setting fixed straight CAV special inlet channel;
（2）Q min when the ratio is not less than 2400 standard cars/hour and the lowest CAV ratio is not less than 0.50, the requirement of setting a fixed straight-running CAV special inlet lane is met.
For the driving direction meeting the setting condition, the fixed straight-running CAV special entrance lane should be set at the straight-running lane closest to the center line of the road, as shown in fig. 2 and 3.
Examples
The embodiment of the method for judging the setting condition of the fixed straight-running CAV special entrance lane at the signalized intersection is given by the implementation process and the inspection result, but the protection scope of the invention is not limited by the following embodiment.
1. Intersection overview
The method selects Yuhua road of Shijiazhuang city and the friendship street intersection for example analysis. The intersection is a cross signal intersection, and the minimum value of the sum of the hourly traffic volumes of all the entrance roads in all directions is obtained by investigating the traffic running condition of the intersection as shown in table 1.
TABLE 1 minimum value of sum of hourly traffic volumes of all entrance roads in all directions of friendship street Yuhua road intersection
2. CAV special entrance way arrangement scheme
According to the setting conditions of the fixed straight-running CAV special inlet lane, the lowest CAV proportion of the embodiment is determined, and is shown in the table 2. It was found that there is a higher demand for the minimum CAV ratio for setting up a fixed straight-going CAV-only entrance lane when traffic is small. For the east-west approach at the intersection, a fixed straight-going CAV special approach is set to meet the requirement that the lowest practical CAV proportion is not less than 0.35 all day long; the special fixed straight-going CAV entrance lane to be arranged on the north-south entrance lane needs to meet the requirement that the lowest practical CAV ratio is not less than 0.70 all day long, and the special fixed straight-going CAV entrance lane is arranged on the straight-going lane of the entrance lane closest to the center line of the road, as shown in the attached figure 4.
TABLE 2CAV Special Inlet lane setup requirements
3. Simulation evaluation
Establishing a special fixed straight-running CAV entrance road and a mixed-running traffic flow environment of the intersection under the condition of no setting, taking the actually measured traffic volume and signal timing data as input, setting the simulation duration to be 3600s, programming iteration and carrying out comparative analysis on the set simulation result and the simulation result under the condition of no setting, wherein the obtained simulation results are shown in tables 3 and 4.
TABLE 3 simulation results of east-west entryways
TABLE 4 simulation results of north-south approach
The results show that when the lowest CAV proportion required for setting the fixed straight-running CAV special entrance lane shown in table 2 is reached, compared with the situation that no setting is carried out, the fixed straight-running CAV special entrance lane setting scheme in four directions correspondingly has smaller vehicle-to-vehicle delay and vehicle-to-vehicle oil consumption, and more vehicles can pass through in each period on average. From the benefit aspect, the number of vehicles passing through the inlet lane in the four directions of the intersection is increased by 1.11% -3.22% at the peak time in the morning and at night, the delay of each vehicle is reduced by 4.33% -8.45%, and the oil consumption of each vehicle is reduced by 6.57% -9.03%, so that the effectiveness of the arrangement scheme of the fixed straight-running CAV special inlet lane at the friendship street-Yuhua road signalized intersection is proved, and the invention has universal applicability in practical application.
Claims (2)
1. Fixed type straight-going CAV special for signalized intersectionThe method for judging the setting condition of the entrance lane is characterized in that the driving direction of the entrance lane special for the fixed straight-running CAV is supposed to meet the basic road condition that the number of straight-running lanes of the entrance lane is not less than 2; the traffic volume does not fluctuate obviously along with time, namely the difference between the maximum value and the minimum value of the sum of the traffic volumes of all entrance lane hours in the direction of 6:00-22:00 in the 25 nd Tuesday survey of illegal holidays in one year is not more than 150 standard cars/hour; the sum of all the hourly traffic volumes of the entrance roads is recorded asQTaking the minimum value and recording asQ min Recording the minimum value of the ratio of the sum of the CAV quantity of all the entrance roads in the direction of each hour from 6:00 to 22:00 to the sum of the hourly traffic volume of all the entrance roads as the lowest CAV proportion, and setting the following judgment conditions for setting the fixed straight-running CAV special entrance road at the signalized intersection as follows:
when the number of straight lanes at the entrance lane is 2,Q min More than or equal to 600 standard cars/hour and less than 2400 standard cars/hour, the lowest CAV proportion is not less than-0.0001Q min +0.7740, meeting the requirement of setting fixed straight CAV special inlet channel;
when the number of straight lanes at the entrance lane is 2,Q min When the standard car/hour is larger than or equal to 2400 standard cars and the lowest CAV proportion is not less than 0.50, the requirement of setting a fixed straight-running CAV special entrance lane is met;
when the number of the straight lanes of the inlet lane is not less than 3,Q min More than or equal to 600 standard cars/hour and less than 2100 standard cars/hour, the lowest CAV proportion is not less than-0.0001Q min +0.5446, meeting the requirement of setting fixed straight CAV special inlet channel;
when the number of the straight lanes of the inlet lane is not less than 3,Q min When the ratio is larger than or equal to 2100 standard cars/hour and the lowest CAV is not less than 0.25, the requirement of setting a fixed straight-running CAV special entrance lane is met.
2. The method for judging the setting conditions of the special crossroad for the fixed straight-running CAV at the signalized intersection according to claim 1, wherein the data survey requirement of the proportion of the sum of hourly traffic volumes of all the crossroads to the lowest CAV is that two nonadjacent quarter clocks are selected as survey time periods every hour from 6:00 to 22:00, an interval of 15 minutes is required between every two survey time periods, and the traffic volume obtained by the survey every hour is converted into hourly traffic volume.
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