A Real-time Calculation Method of Saturation Flow Rate at Signalized Intersection

Abstract

The invention discloses a real-time calculation method for the saturation flow rate of a signalized intersection. The invention calculates the headway of vehicles in the entrance road within a period; if the number of vehicles in the entrance road within the period is less than the vehicle threshold, the empirical saturated headway calculation period is used. The saturated flow rate of the inner entrance; if the number of vehicles at the entrance within the cycle is greater than or equal to the vehicle threshold, set the saturated headway threshold interval according to the vehicle type to obtain the headway in the saturated state; If the number of vehicles is less than the vehicle threshold in saturated state, the saturated flow rate of the inlet road in the cycle is calculated through the experience of saturated headway; Saturated headway, the saturated flow rate of the inlet channel in the corrected period is obtained by the average value correction method. The invention improves the calculation accuracy and meets the requirement of dynamically extracting the saturated flow rate.

Description

technical field [0001] The invention belongs to the technical field of traffic signal control, in particular to a real-time calculation method for the saturated flow rate of a signalized intersection. Background technique [0002] With the continuous increase of urban population and motor vehicle ownership, problems such as poor road network, insufficient facilities, and traffic congestion are becoming more and more prominent, and the impact and pressure on urban traffic management are also increasing. The problem of urban road traffic congestion It has become one of the bottlenecks that impair economic development, reduce people's quality of life, and weaken economic vitality. As the node of the urban road network, the intersection is the throat that restricts the traffic capacity of the entire road network. There are conflicts between motor vehicles, non-motor vehicles and pedestrians in different directions within the range of the intersection, so it is easy to travel co...

AI Technical Summary

Problems solved by technology

At present, the saturated headway is measured by the time difference between the two vehicles before and after reaching the stop line. In order to avoid the start-up delay at the beginning of the green light, the headway is calculated from the fourth car until the car stops behind the stop line when the green light is on. For the last car, take the reciprocal of the average value of the saturated headway and multiply it by 3600 as the saturated flow rate, but the saturated flow rate obtained by this method cannot meet the requirements for the accuracy of the saturated flow rate, because there are differences in practical applications Effects of vehicle type and headway of unsaturated traffic flow state on measured saturated headway

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