A regional safety evaluation method for expressway exit ramps

Abstract

The invention discloses a highway exit ramp area safety evaluation method comprising the following steps: analyzing types of traffic conflicts according to gathered traffic conflict data, using a driving simulator to build a traffic conflict scene in a highway ramp area, gathering response time of the driver and emergency brake deceleration data, and further building response times of the driver under different scenes and the emergency brake deceleration probability density distribution; aiming at each simulation conflict, deducing the corresponding accident formation probability according tothe specific scene; carrying out scene classification according to real happening conditions for each specific lane changing conflict, and using the accident probability calculating method of the corresponding scene to solve the accident probability; accumulating the conflict accident probability, obtaining the accident prediction number in an observation period, or obtaining the accident prediction number in a specific time through conversion.

Description

technical field [0001] The invention relates to a safety evaluation method for an expressway exit ramp area, which belongs to the technical field of intelligent transportation. Background technique [0002] The off-ramp, as a prone place for expressway traffic accidents, has become increasingly severe in terms of traffic safety. Statistics from abroad show that nearly 40% of highway traffic accidents occur on ramps, and the number of accidents occurring on exit ramps is about twice that of entrances. Therefore, how to accurately evaluate the traffic safety of off-ramps and propose corresponding improvement measures to improve the traffic safety of off-ramps and even the entire expressway has become a hot spot in the field of engineering technology. [0003] At present, foreign researches on expressway off-ramps have been relatively in-depth, and the research focuses on the optimization of some design parameters of off-ramps, the analysis of traffic efficiency, and the resea...

AI Technical Summary

Problems solved by technology

Due to the late start of the collection and sorting of accident data in our country, especially the large number of newly opened expressways, there is a lack of accident data records, which makes it difficult to apply the accident data analysis method in the safety evaluation of exit ramps

The traffic conflict method is an important means of non-accident traffic safety evaluation, and it has been widely used in my country. However, as far as the safety evaluation of expressway exit ramps is concerned, there are disadvantages such as difficult deployment of conflict observation equipment and difficult collection of conflict data.

The existing calibration methods also have the following main shortcomings: setting the threshold to select traffic conflicts is too subjective; the lane-changing conflicts are not defined from the perspective of probability, and the randomness of the process from conflicts to accidents is ignored; for multiple scenarios of lane-changing conflicts Insufficient awareness to effectively assess conflict

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