Optimization method for combined phase position of needed lane

Abstract

The invention relates to an optimization method for a combined phase position of a needed lane. According to the saturation of an intersection, a phase position optimization method under proper lane control is adopted. If the saturation is larger than one, a phase position optimization method under super-saturation lane control is adopted, and otherwise, a phase position optimization method under under-saturation lane control is adopted; the flow balance degree of a lane permitting vehicles to pass through in the phase position is calculated in real time, on the premise that the condition is met, a capacity increasing lane is inserted, the capacity increasing lane and a key lane form a small phase position under the phase position, and therefore vehicle flow can be balanced, and finite space and time resources can be fully utilized; when the phase position is optimized, the period of the intersection is adjusted in real time and optimized, it is guaranteed that lanes in high transportation demand take priority to permit vehicles to pass through particularly in an environment where the vehicle flow of the lane is large, and coordination control of vehicle flow between the key lane and a downstream intersection is adjusted in real time. According to the method, not only are the time and space resources fully utilized, but also the traffic jam problem under large flow is relieved to a certain extent.

Description

technical field [0001] The invention relates to a method for optimizing the phase sequence of traffic signals, in particular to a method for optimizing the combined phase of required lanes. Background technique [0002] At present, the relatively mature traffic signal control strategies include timing control, induction control and adaptive control. These control methods only consider how to allocate a reasonable green light time for traffic flow in all directions on the basis of the traditional phase design scheme, and pass through in a fixed order according to the phase design scheme, and only the phase time changes. If there are many vehicles queuing at a certain phase, and there are few vehicles queuing in front of it, the phase with fewer vehicles in front must be released first, and then the phase with more vehicles will be released in accordance with the fixed phase sequence. If there are too many vehicles, they cannot be released in time and cause traffic jams at th...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the defects of the existing phase design schemes, satisfy the request of some lanes with heavy traffic loads that require priority release, and make full use of the space-time resources of unbalanced traffic flow in the release lanes in the phase; The optimization method uses the traffic demand of the lane as the judgment standard to realize the priority release of vehicles in the lane, and at the same time judges whether it is necessary to insert a new release lane in real time based on the unbalanced degree of traffic flow in the release lane in the phase (capacity lanes and key lanes constitute the phase under the phase). small phase) to make full use of spatio-temporal resources in unbalanced traffic flow, and realize phase optimization under lane combination at intersections

Images