Method for evaluating traffic safety of signal intersection during phase switching facing operation management stage

Abstract

The invention belongs to the field of road traffic safety. In order to provide a method for traffic safety evaluation during phase switching and achieve the purpose, the invention adopts the technical scheme that the method for evaluating traffic safety of signal intersection during phase switching facing an operation management stage comprises the following steps of: calculating encountering time difference PET, wherein PET=(Y+AR+te)-tc-Te; calculating collision loss of momentum, assuming that two cars collide with each other by keeping the original speed, according to the collision kinetic theory, calculating the loss of momentum before and after collision according to formula 5, wherein the system collision before momentum Pm; calculating the collision occurrence probability P; and carrying out evaluation on the traffic safety of the intersection during phase switching. The method is mainly applied to the design of roads meeting the requirement of traffic safety.

Description

technical field [0001] The invention belongs to the field of road traffic safety, and in particular relates to a traffic safety evaluation method for phase switching at signalized intersections in the operation management stage. Background technique [0002] In my country's urban road traffic accidents, 25% to 35% of the accidents occur at road intersections and adjacent road sections, and about 90% of the accidents occur during the green interval (phase switching period). The above situation still exists for areas such as urban suburbs and ports. Therefore, in order to protect the life and property safety of traffic participants, it is necessary to track the traffic safety evaluation of the intersection during the operation and management stage of the intersection. In addition, traffic safety evaluation is also very necessary when comparing the effects before and after the improvement of the intersection. [0003] The commonly used traffic safety evaluation methods are di...

AI Technical Summary

Problems solved by technology

[0004] However, the existing traffic conflict analysis methods usually only quantitatively evaluate the traffic safety during the green light period, ignoring the importance of traffic safety during the green interval (under the condition of phase switching)

Although the vast majority of intersection accidents occur during the green interval, the existing methods for evaluating traffic safety at this stage only stay on the extensive indicators such as the number or time of running red lights, and cannot accurately evaluate the phase switching of signalized intersections. security

Such indicators can only describe the danger of emptying vehicles, but cannot reflect the danger of vehicles entering the intersection in the next phase, nor can they fully reflect the impact of vehicle speed, phase structure, and intersection geometric design on safety

The time of vehicle arrival at the collision point during the green light interval is affected by the clearance distance and the entry distance; the vehicle collision angle varies with the geometric design and phase structure of the intersection; and the vehicle collision speed is also different due to the randomness of traffic flow ; These factors have increased the difficulty and complexity of traffic safety evaluation during phase switching

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