Real-time calculating method for saturation flow rate of signal intersection

Abstract

The invention discloses a real-time calculating method for saturation flow rate of a signal intersection. The real-time calculating method comprises the steps of calculating a time headway of vehiclesin an inlet channel in a period; if the number of the vehicles in the inlet channel in the period is lower than a vehicle threshold, calculating the saturation flow rate of the inlet channel in the period by means of an empirical saturation time headway; if the number of the vehicles in the inlet channel in the period is higher than or equal with the vehicle threshold, setting a saturation time headway threshold interval according to the vehicle type, thereby obtaining the time headway in the saturation state; if the number of the vehicles in the saturation state of the inlet channel in the period is lower than the vehicle threshold in the saturation state, calculating the saturation flow rate of the inlet channel in the period through the empirical saturation time headway; if the numberof the vehicles of the inlet channel in the saturation state in the period is higher than or equal with the vehicle threshold in the saturation state, calculating the saturation time headway of the inlet channel in the period, and obtaining the corrected saturation flow rate of the inlet channel in the period through a mean value correction method. The real-time calculating method improves calculation accuracy and satisfies a requirement for dynamically extracting the saturation 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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