Method for calculating lengths of diamond interchange deceleration ramps by utilizing traffic conflicts

Abstract

The invention discloses a method for calculating lengths of diamond interchange deceleration ramps by utilizing traffic conflicts. The method comprises the following steps of establishing a conflict delay model; and analyzing factors of a ramp length, wherein the ramp length is decided through the number of delayed vehicles in a conflict area, the number of the delayed vehicles in the conflict area is decided through the number of delayed vehicles in a unit time and an average delay time of the vehicles, the number of the delayed vehicles in the unit time indicates a difference between the number of vehicles passing through the conflict area at once and the number of vehicles passing through the conflict area in the unit time, the number of vehicles passing through the conflict area at once is decided through the probability that one vehicle stream occurs and the probability that the vehicle stream passes through a time headway, the number of vehicles passing through the conflict area in the unit time is decided through the number of vehicles passing through the conflict area at once and a flow rate of the vehicle stream, and the average delay time is the sum of the delay time, in the conflict area, of the vehicle stream.

Description

technical field [0001] The invention belongs to the field of road traffic management, and in particular relates to a method for calculating the length of a deceleration ramp at a rhombus interchange by using traffic conflicts. Background technique [0002] At present, diamond-shaped interchanges are less used in expressways. The main reason is that technicians do not have a good grasp of the relevant technical indicators of their key parts. Diamond-shaped interchanges in the present invention refer to T-shaped diamond-shaped interchanges that are provided with toll booths. Control, vehicles are prone to conflicts on this road section, and queues are prone to occur during conflicts. At present, there are few studies on the distance between the non-signal-controlled intersection and the diversion point of the diamond-shaped interchange. However, due to traffic conflicts, the traffic capacity is reduced and traffic congestion Serious cases do happen from time to time. [0003]...

AI Technical Summary

Problems solved by technology

For the two left-turning vehicles at the non-signalized intersection of the diamond interchange, the vehicles in the two left-turning directions have the same right of way. When there is no signal control, the most important problem is the conflict problem. The conflict will easily cause changes in traffic flow and eventually lead to delays. When the vehicle queuing time is too long, it is easy to cause vehicles to line up in the deceleration lane to the exit of the diamond interchange. Therefore, conflicts at intersections and delays in queuing affect the setting of the deceleration lane and the length of the deceleration ramp

[0004] The traditional calculation methods for conflicts at intersections are mainly based on the gap theory, that is, vehicles have the right of way on the main road in the intersection area without delay, and the right of way at secondary intersections is affected by the main road and has delays. Vehicles use the main road acceptable clearance in the

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