Roundabout traffic capacity calculation model and analysis method

Abstract

The invention relates to a roundabout traffic capacity calculation model and an analysis method, which belong to the technical field of traffic. Based on two set conditions: the maximum traffic volumeof each entrance lane is positively correlated with the traffic capacity, and the traffic capacity is simulated through detecting the traffic volume of the entrance lane; and the relation between loop traffic and the single lane traffic capacity is an exponential function, a model c=exp(a-b1c1-b2c2) is built, and specific implementation steps are put forward. The roundabout traffic capacity calculation model and the analysis method have the advantages that the model data are clearly and simply acquired, the complexity of model calibration is simplified, the running characteristics of a vehicle flow can be reflected accurately, the roundabout traffic capacity calculation precision is improved, a real running condition is better met, and a strong basis is provided for solving roundabout congestion and urban road traffic planning.

Description

technical field [0001] The invention relates to a calculation model and an analysis method for the traffic capacity of a roundabout, belonging to the technical field of traffic. Background technique [0002] Roundabouts are also called roundabouts, which enable all vehicles at the entrance intersection to travel around the island in the same direction, and have the advantages of continuous vehicle driving, safety, and increased traffic capacity. However, with the sharp increase of traffic volume, under high-load traffic conditions, the traffic flow state of the intersection will show the characteristics of slow traffic flow in the ring road, difficulty in interweaving vehicles, and great obstacles for vehicles entering and exiting. The endless loop that leads to congestion at roundabouts. At present, there are still a large number of roundabouts on urban and rural roads in our country. Therefore, it is of great practical significance to study the traffic capacity of roundab...

AI Technical Summary

Problems solved by technology

[0012] In this report, it is difficult to determine the conflict flow. Generally speaking, the point where the traffic flow lines in two directions meet is the conflict point, and the traffic around the conflict point is the conflict flow. However, the concept of "periphery" and the Surrounding traffic is difficult to quantify through investigation, especially in roundabouts. In addition, conflict traffic refers to the traffic at conflict points where vehicles change lanes, turn left and go straight, and go out and go straight. This kind of traffic is difficult even in simulation software. There will also be large errors in detection and naked eye observation, and the data obtained by different observers will vary greatly, resulting in the inability to guarantee the accuracy of the model; and the conflict point is not at a fixed position, which also brings great problems to the collected data. Uncertainty

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