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A road traffic safety evaluation method based on a conflict extreme value

A technology for safety evaluation and road traffic, applied in traffic flow detection, complex mathematical operations, etc., can solve the problems of poor timeliness of safety evaluation methods and achieve high timeliness effect

Pending Publication Date: 2019-05-03
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to propose a road traffic safety evaluation method based on the conflict extreme value in order to solve the problem of poor timeliness of the safety evaluation method of traffic conflict at the present stage

Method used

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  • A road traffic safety evaluation method based on a conflict extreme value
  • A road traffic safety evaluation method based on a conflict extreme value
  • A road traffic safety evaluation method based on a conflict extreme value

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specific Embodiment approach 1

[0033] Specific implementation mode one: the specific process of a road traffic safety evaluation method based on conflict extreme value in this implementation mode is as follows:

[0034] The invention utilizes the traffic conflict technology to construct the evaluation index of the road traffic safety level. Different from the traditional safety evaluation index based on traffic conflicts, the present invention does not rely solely on the number (rate) of traffic conflicts, but constructs a traffic safety evaluation index that can reflect the accident risk level through the extreme value distribution of conflict index values. Through the reasonable determination of blocks, the constructed evaluation index can reflect the traffic safety level in a short period (such as 15 minutes). The specific content includes the selection of traffic conflict indicators, the construction of conflict extreme value distribution model, and the evaluation of traffic safety level.

[0035] Step...

specific Embodiment approach 2

[0053] Specific embodiment two: what this embodiment is different from specific embodiment one is, select traffic conflict index in described step one, obtain traffic conflict data (distance collision time TTC data) according to the traffic conflict index of choosing; Concrete process is:

[0054] The traffic conflict index is represented by TTC from the collision time (the traffic conflict index has many kinds besides TTC and PET, such as TTA, TTZ, DRAC, etc., which one to use depends on the situation);

[0055] The formula for calculating the time to collision TTC is:

[0056] TTC=S 12 / (V 2 -V 1 )

[0057] In the formula, S 12 is the distance between two vehicles in m; V 1 , V 2 are the speeds of the front and rear vehicles respectively, in m / s;

[0058] According to the selected traffic conflict index, the time to collision TTC traffic conflict data is obtained.

[0059] The present invention mainly utilizes space-time approaching traffic conflict indicators, such ...

specific Embodiment approach 3

[0061] Specific embodiment three: the difference between this embodiment and specific embodiment one is that the traffic conflict index is selected in the step one, and the traffic conflict data (post-invasion time PET data) is obtained according to the traffic conflict index selected; the specific process is:

[0062] Intrusion time PET after the traffic conflict index is passed (there are many traffic conflict indicators besides TTC and PET, such as TTA, TTZ, DRAC, etc., which one to use depends on the situation);

[0063] The post-invasion time PET calculation formula is:

[0064] PET = t 2 -t 1

[0065] In the formula, t 2 is the time for the following vehicle to reach the conflict area, t 1 is the time when the preceding vehicle leaves the conflict area (the conflict area is the area where the trajectories of two vehicles overlap);

[0066] According to the selected traffic conflict index, PET traffic conflict data at post-invasion time were obtained.

[0067] The p...

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Abstract

The invention discloses a road traffic safety evaluation method based on a conflict extreme value, and relates to a road traffic safety evaluation method. The objective of the invention is to solve the problem of poor timeliness of a safety evaluation method for traffic conflicts at the present stage. The method comprises the following steps: 1, selecting a traffic conflict index, and obtaining traffic conflict data according to the selected traffic conflict index; 2, constructing a block extreme value distribution model according to the traffic conflict data obtained in the step 1; the methodcomprises the following specific steps: 1, carrying out regional division on obtained traffic conflict data; 2, obtaining extreme value data of the zone group; 2, constructing a block extreme value distribution model; 2, estimating the block extreme value distribution model by adopting a maximum likelihood method to obtain parameters in the block extreme value distribution model; and 3, evaluating the traffic safety level based on the conflict extreme value distribution model in the step 2. The method is applied to the field of traffic safety evaluation.

Description

technical field [0001] The invention relates to a road traffic safety evaluation method. Background technique [0002] The problem of road traffic safety has always been one of the important issues affecting the sustainable development of the world, which causes a large number of casualties and huge property losses every year. According to the statistics of the World Health Organization, road traffic accidents cause about 1.3 million deaths and more than 20 million non-fatal injuries in the world every year. In order to reduce road traffic injuries, it is necessary to reasonably evaluate the safety level of road traffic facilities, so as to find out possible problems and propose targeted improvement measures. [0003] At present, the evaluation of road traffic safety level is mainly based on historical accident data. The safety evaluation indicators constructed mainly include accident rate per million vehicles, accident rate per million vehicle kilometers, casualty rate per...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/18G08G1/01
Inventor 郑来孙佳豪张恩泽由冰玉曹梦迪
Owner HARBIN INST OF TECH
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