Abstract

Info

Title:: Optimization algorithm of green light interval based on traffic condition

Author(s):: LI Tie-jun; CHANG Xu; (School of Highway, Chang’an University, Xi’an 710064, Shaanxi, China)

Keywords:: traffic engineering; green light interval; traffic condition; time of yellow light; all-red time; optimization

Abstract:: In order to determine the green light interval time in different traffic states and greatly improve the traffic capacity at intersection, a calculation method which replaced speed with traffic flow into kinematical equation was put forward. Greenshields model, Greenberg model and Underwood model were used to analyze the relationship between green light interval time and traffic according to different conditions of traffic volumes. A calculation method of green light interval time was established under different traffic conditions and volumes. Combining the traffic volume data of the intersection in morning rush hour in Xiaozhai Road and Chang’an Road in Xi’an City, VISSIM simulation on running state under signal timing conditions based on original and improved algorithm was conducted. The results show that the new model can significantly improve the passing vehicle numbers, enhance the average velocity and reduce the block percentage at intersection. So the method can optimize the green light interval time and improve the traffic capacity of intersection.