Method for calculating traffic capacity of left-turn lane under left-turn allowable phase

Abstract

The invention provides a method for calculating the traffic capacity of a left-turn lane under a left-turn allowable phase. The method comprises the following steps of: step 1, collecting basic data;2, calculating the maximum passing vehicle number GpL (pcu) of a left-turn release unit of an intersection; 3, calculating the time t1 (s) of a green light initial stage; 4, calculating the time t2 (s) of a non-green-light initial stage; 5, calculating the traffic capacity CAP1 (pcu / h) of a left-turn lane at the green light initial stage; 6, calculating the traffic capacity CAP2 (pcu / h) of the left-turn lane in the non-green-light initial stage; and step 7, calculating the sum CAPL (pcu / h) of the traffic capacity of the left-turn lane in a whole signal period. According to the method, the mutual influence between left-turn traffic flow and opposite traffic flow under the left-turn allowable phase is considered, so that the traffic capacity of left-turn vehicles at the intersection of the left-turn allowable phase can be calculated more accurately; and domestic data are adopted in a modeling process, so that the method is more suitable for the actual situation of a domestic intersection.

Description

technical field [0001] The invention relates to the technical field of traffic and transportation engineering, in particular to a method for calculating the traffic capacity of a left-turn lane under a left-turn permission phase. Background technique [0002] Intersection capacity calculation is a classic problem in the field of transportation. In the existing theoretical system, the capacity model is mainly divided into two schools based on the stop line and the model based on the conflict point. In the method based on the stop line, as long as the vehicle passes the stop line, it is regarded as having passed the intersection. There are two mainstream algorithms: the passing saturation flow rate correction coefficient method proposed in the American HCM manual and the stop line section method recommended in the domestic "Urban Road Design Code" (CJJ90-2012). In the method based on the conflict point, only when the vehicle passes the conflict point is it considered to have...

AI Technical Summary

Problems solved by technology

This method is different from the idea that the number of crossing vehicles depends on the size of the gap in the traditional gap theory. It can avoid the problem that the traffic environment assumption is too ideal in the existing research, and establishes a permissible phase crossing that is more in line with my country's traffic environment and truly reflects the operating efficiency of vehicles. port capacity analysis model

Images