CN116383556A - Intersection turning opening position calculation method - Google Patents

Intersection turning opening position calculation method Download PDF

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CN116383556A
CN116383556A CN202310375157.1A CN202310375157A CN116383556A CN 116383556 A CN116383556 A CN 116383556A CN 202310375157 A CN202310375157 A CN 202310375157A CN 116383556 A CN116383556 A CN 116383556A
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intersection
turning
vehicle
distance
vehicles
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冯忠祥
张秀伟
蒋旭
黄从俊
张德豪
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Hefei University of Technology
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Hefei University of Technology
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Abstract

The invention discloses a method for calculating the position of a turning opening of an intersection, which belongs to the field of traffic safety and management, wherein a bayonet device is used for obtaining videos of the positions of vehicles leaving the intersection and frequent accidents, determining driving data of a target vehicle, calculating the distance of the target vehicle before braking and decelerating, setting an ideal threshold value of the safety distance between two vehicles, and determining that the center separation belt of the intersection is suitable for turning opening; the method has the advantages that through collecting and analyzing the data of the collision of the turning-around traffic flow at the road junction and other traffic flows, the turning-around opening position of the road junction is scientifically calculated through the distance of the vehicles before braking and decelerating and the ideal threshold value of the safety distance between the two vehicles, the actual requirements of turning-around traffic flow at the road junction are met, the collision of the turning-around traffic flow with the traffic flow turning-around traffic flow in the same direction, clockwise and right direction and anticlockwise and left direction is effectively reduced, and the traffic passing efficiency is improved.

Description

Intersection turning opening position calculation method
Technical field:
the invention relates to the field of traffic safety and management, in particular to a method for calculating the position of a U-turn opening of an intersection.
The background technology is as follows:
in the traffic flow of the plane intersection, the left-turning traffic flow is the traffic flow with the most conflict points, and the turning traffic is turned to the same side as the left-turning traffic, so that the traffic efficiency and the traffic safety of the intersection are also affected to a certain extent. Therefore, solving the problem of good turning traffic is also a key point for improving the traffic capacity and the safety of the road network and enhancing the reliability of the road network.
The method mainly adopts the modes of turning around in the intersection, turning around before the stop line of the entrance way and turning around in the width-expanding section and the transition section of the entrance way, and the method is mainly used for analyzing the mode of turning around before the stop line of the entrance way. According to the national road traffic safety law, when a gap is arranged in the central greening separation belt in front of a stop line of an intersection, a vehicle turning around does not need to pay attention to a left-turning signal lamp, and can turn around on the premise of not influencing traffic, and due to the lack of control of a signal lamp, the turning around traffic flow in the turning around mode often collides with the same left-turning traffic flow, clockwise right-turning traffic flow and anticlockwise left-turning traffic flow, and the passing efficiency is greatly influenced (as shown in fig. 1).
Based on the defects of the prior art, the invention aims to provide a method for calculating the position of a turning opening of an intersection, which reduces the conflict between turning traffic and traffic turning traffic which turns left, traffic turning right clockwise and traffic turning left anticlockwise.
The invention comprises the following steps:
in order to overcome the defects of the prior art, the invention aims to provide a method for calculating the turning opening position of an intersection, which is used for scientifically calculating the turning opening position of the intersection by collecting and analyzing data of the collision of the turning traffic flow of the intersection and other traffic flows and by the distance of the vehicles before braking and decelerating and the ideal threshold value of the safety distance between the two vehicles, so that the method is more in line with the actual requirements of turning of the vehicles at the intersection, effectively reduces the collision of the turning traffic flow and the traffic flow which turns left, clockwise and right and anticlockwise, and improves the traffic passing efficiency.
The technical scheme of the invention is as follows:
a method for calculating the position of a U-turn opening of an intersection comprises the following steps:
(1) Setting a bayonet device at an intersection of at least two-way six lanes at an exit road and an accident frequent place, and obtaining videos of the vehicle exiting the intersection and the accident frequent place by using the bayonet device;
(2) Reading a video image sequence through software programming, sequentially circling the target vehicles in each frame of image, and determining the time t when the target vehicles leave the intersection 1 The motion type, the speed and the acceleration, and acquires the braking deceleration moment t of the vehicle before collision 2 And the distance L between the moment and the turning vehicle to generate a vehicle information file;
(3) Calculating the distance S of the target vehicle before braking and decelerating according to the target vehicle data obtained in the step (2) 1 T 2 Speed of time V t ；
(4) According to t 2 Speed of time V t Setting a threshold S of the safety distance between two vehicles Secure Is a range of intervals;
(5) According to the distance S of the target vehicle moving before braking and decelerating in the step (3) under the condition of conforming to the national relation to the guiding lane line and the length of the gradual change section 1 Two-vehicle safety distance threshold S in step (4) Secure Determining the turning open position of the central separation belt of the intersection, wherein the open position is not less than S 1 And S is equal to Secure And (3) summing.
In the step (2), the motion type of the target vehicle when the target vehicle leaves the intersection is determined and divided into uniform motion, uniform deceleration motion and uniform acceleration motion.
Acquiring a vehicle information file according to the step (2), classifying according to three different movement types of vehicle information, preprocessing the three types of vehicle information, removing data of overspeed vehicles, and calculating the movement distance S of each type of target vehicle before braking and decelerating 1 : uniform motion S 1 ＝V Even distribution (t 2 -t 1 )；V t ＝V Even distribution ；
Uniform deceleration movement S 1 ＝V Homogenizing and subtracting (t 2 -t 1 )-1/2a Homogenizing and subtracting (t 2 -t 1 ) 2 ；V t ＝V Homogenizing and subtracting -a Even adding (t 2 -t 1 )；
Uniform acceleration motion S 1 ＝V Even adding (t 2 -t 1 )+1/2a Even adding (t 2 -t 1 ) 2 ；V t ＝V Even adding +a Even adding (t 2 -t 1 )。
In the step (4), the default turning-around vehicle transversely passes through the turning-around opening position perpendicular to the driving lane, the turning-around vehicle clings to the opening and moves to the near end of the intersection, and the final speed of the driving vehicle is 0 when the two vehicles are contacted; let t 2 Speed of time V t The prior comparison table of the speed and the braking distance is compared to determine the threshold S of the safety distance between two vehicles Secure . The method is characterized by determining that the central separation belt of the intersection is suitable in turning opening, and specifically comprises the following steps:
distance S of vehicle before braking and decelerating 1 With a threshold S of safety distance between two vehicles Secure And taking the sum as a sample, sorting the data in the sample from large to small, and taking the average value of the previous 10% bit sample as the near-end distance from the intersection to the opening position.
The invention has the advantages that:
1. the invention provides a method for calculating the position of a turning opening of an intersection, which is used for determining the position of the turning opening of a central separation belt of the intersection by a scientific calculation method, so that the conflict between turning traffic and the traffic which turns left, clockwise and counterclockwise can be effectively reduced, and the traffic passing efficiency can be improved.
2. According to the invention, through collecting and analyzing the data of the intersection turning-around traffic flow and other traffic flow conflicts, instead of fixed setting construction according to the related construction standard, the intersection conflict degree can be reflected more truly, and the set intersection turning-around opening position meets the actual requirements of intersection vehicle turning-around.
3. The invention takes the average value of the first 10% data farthest from the intersection as the distance of the vehicle before braking and decelerating, gives the vehicle sufficient reaction time to collide with the turning vehicle, and simultaneously can reduce the problem of inaccurate data caused by overlong reaction time of individual vehicles due to other factors.
4. According to the gradient and the speed limit of the intersection, an ideal threshold value of the safety distance between two vehicles is set, collision is avoided under the maximum running speed of the intersection, and the position of the U-turn opening of the intersection is more fit with the actual requirement.
Description of the drawings:
fig. 1 is a schematic diagram showing that the u-turn traffic of the present invention often collides with other vehicles.
Fig. 2 is a flow chart of the method of the present invention.
The specific embodiment is as follows:
the following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
As shown in fig. 2, the method for calculating the position of the u-turn opening of the intersection comprises the following steps:
(1) Setting a bayonet device at an intersection of at least two-way six lanes at an exit road and an accident frequent place, and obtaining videos of the vehicle exiting the intersection and the accident frequent place by using the bayonet device;
(2) Reading a video image sequence through software programming, sequentially circling the target vehicles in each frame of image, and determining the time t when the target vehicles leave the intersection 1 The motion type, the speed and the acceleration, and acquires the braking deceleration moment t of the vehicle before collision 2 Generating a vehicle information file;
(3) Calculating the distance S of the target vehicle before braking and decelerating according to the target vehicle data obtained in the step (2) 1 T 2 Speed of time V t ；
(4) According to t 2 Speed of time V t Setting a threshold S of the safety distance between two vehicles Secure Is a range of intervals;
(5) According to the distance S of the target vehicle moving before braking and decelerating in the step (3) under the condition of conforming to the national relation to the guiding lane line and the length of the gradual change section 1 Two-vehicle safety distance threshold S in step (4) Secure Determining intersection center separationThe opening position with turning around is not less than S 1 And S is equal to Secure And (3) summing.
In the step (2), the motion type of the target vehicle when the target vehicle leaves the intersection is determined and divided into uniform motion, uniform deceleration motion and uniform acceleration motion.
Acquiring a vehicle information file according to the step (2), classifying according to three different movement types of vehicle information, preprocessing the three types of vehicle information, removing data of overspeed vehicles, and calculating the movement distance S of each type of target vehicle before braking and decelerating 1 : uniform motion S 1 ＝V Even distribution (t 2 -t 1 )；V t ＝V Even distribution ；
Uniform deceleration movement S 1 ＝V Homogenizing and subtracting (t 2 -t 1 )-1/2a Homogenizing and subtracting (t 2 -t 1 ) 2 ；V t ＝V Homogenizing and subtracting -a Even adding (t 2 -t 1 )；
Uniform acceleration motion S 1 ＝V Even adding (t 2 -t 1 )+1/2a Even adding (t 2 -t 1 ) 2 ；V t ＝V Even adding +a Even adding (t 2 -t 1 )。
In the step (4), the default turning-around vehicle transversely passes through the turning-around opening position perpendicular to the driving lane, the turning-around vehicle clings to the opening and moves near the intersection, and the final speed of the driving vehicle is 0 when the two vehicles are contacted; let t 2 Speed of time V t The safety distance threshold S between two vehicles is determined by comparing with the existing comparison table of vehicle speed and braking distance (shown in table 1) Secure . (note: e.g. degree of turning V) t The braking distance corresponding to the larger vehicle speed is used between two values of the vehicle speed listed in the table below. )
Table 1: vehicle speed and braking distance comparison table
Vehicle speed (km/h) 20 30 40 50 60 70 80 90 100
Braking distance (m) 2.0 4.4 7.9 12.3 17.7 24.1 31.5 39.7 49.2
The method is characterized by determining that the central separation belt of the intersection is suitable in turning opening, and specifically comprises the following steps:
distance S of vehicle before braking and decelerating 1 With a threshold S of safety distance between two vehicles Secure And taking the sum as a sample, sorting the data in the sample from large to small, and taking the average value of the previous 10% bit sample as the near-end distance from the intersection to the opening position.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (5)

1. The intersection turning opening position calculating method is characterized by comprising the following steps of:
(1) Setting a bayonet device at an intersection of at least two-way six lanes at an exit road and an accident frequent place, and obtaining videos of the vehicle exiting the intersection and the accident frequent place by using the bayonet device;
(2) Reading a video image sequence through software programming, sequentially circling the target vehicles in each frame of image, and determining the time t when the target vehicles leave the intersection 1 The motion type, the speed and the acceleration, and acquires the braking deceleration moment t of the vehicle before collision 2 Generating a vehicle information file;
(3) Calculating the distance S of the target vehicle before braking and decelerating according to the target vehicle data obtained in the step (2) 1 T 2 Speed of time V t ；
(4) According to t 2 Speed of time V t Setting a threshold S of the safety distance between two vehicles Secure Is a range of intervals;
(5) According to the distance S of the target vehicle moving before braking and decelerating in the step (3) under the condition of conforming to the national relation to the guiding lane line and the length of the gradual change section 1 Two-vehicle safety distance threshold S in step (4) Secure Determining the turning open position of the central separation belt of the intersection, wherein the open position is not less than S 1 And S is equal to Secure And (3) summing.
2. The method for calculating the position of the u-turn opening of the intersection according to claim 1, wherein the type of movement of the target vehicle when leaving the intersection is determined in the step (2) and is classified into uniform movement, uniform deceleration movement and uniform acceleration movement.
3. The method for calculating the position of the turning opening of the intersection according to claim 2 is characterized in that the vehicle information file is obtained according to the step (2), the vehicle information file is classified according to three different movement types of vehicle information, the three types of vehicle information are preprocessed, data of overspeed vehicles are removed, and the distance S of each type of target vehicle moving before braking and decelerating is calculated 1 : uniform motion S 1 ＝V Even distribution (t 2 -t 1 )；V t ＝V Even distribution ；
Uniform deceleration movement S 1 ＝V Homogenizing and subtracting (t 2 -t 1 )-1/2a Homogenizing and subtracting (t 2 -t 1 ) 2 ；V t ＝V Homogenizing and subtracting -a Even adding (t 2 -t 1 )；
Uniform acceleration motion S 1 ＝V Even adding (t 2 -t 1 )+1/2a Even adding (t 2 -t 1 ) 2 ；V t ＝V Even adding +a Even adding (t 2 -t 1 )。
4. The method for calculating the position of the u-turn opening of the intersection according to claim 2, wherein in the step (4), the default u-turn vehicle transversely passes through the position of the u-turn opening perpendicular to the driving lane, and the u-turn vehicle moves close to the opening and near the intersection; the final speed of the running vehicle is 0 when the two vehicles are contacted; let t 2 Speed of time V t The prior comparison table of the speed and the braking distance is compared to determine the threshold S of the safety distance between two vehicles Secure 。
5. The method for calculating the position of the u-turn opening of the intersection according to claim 1, wherein the determination of the suitability of the u-turn opening of the central dividing strip of the intersection is as follows:
distance S of vehicle before braking and decelerating 1 With a threshold S of safety distance between two vehicles Secure Taking the sum as a sample, sorting the data in the sample from large to small, andthe mean of the first 10% of the samples was taken as the intersection to opening near end distance.
CN202310375157.1A 2023-04-10 2023-04-10 Intersection turning opening position calculation method Pending CN116383556A (en)

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Application Number Priority Date Filing Date Title
CN202310375157.1A CN116383556A (en) 2023-04-10 2023-04-10 Intersection turning opening position calculation method

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Application Number Priority Date Filing Date Title
CN202310375157.1A CN116383556A (en) 2023-04-10 2023-04-10 Intersection turning opening position calculation method

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Publication Number Publication Date
CN116383556A true CN116383556A (en) 2023-07-04

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