Conference Interactive Program
To view the 2013 Annual Meeting Interactive Program
TRB 90th Annual Meeting (January 23-27, 2011)
Advances in Traffic Control Devices
Jan 25 2011 7:30PM- 9:30PM
Marriott, Salon 2
Critical Traffic Volume of Traffic Signal Warrant at Unsignalized Intersections (11-1374)
In order to find the critical flow warrant of signal setting applied to Chinese actual situation, the feasibility of regarding multiple traffic flows as one is demonstrated by probability analysis and gap acceptance theory, and the functional relationship between critical gap and traffic volume of major road was proposed from microscopic angle, introducing time risk model and waiting time model when vehicles on minor road crossed the traffic flow of major road. On this basis, two models of average vehicle delay for unsignalized intersections under absolute and limited priority condition were established. Then, from the viewpoint of traffic efficiency and safety, the minimum value of critical gap was established by 4.5s under limited priority condition. The critical volume curve of traffic signal warrant of three common cross patterns, i.e. 1/1, 1/2, 2/2 cross, was obtained by comparing the average vehicle delays before signal control with after. Comparing to the absolute priority condition, the results showed that the average increments of critical volume under the limited priority condition were 20.33%, 20.95% and 21.43% respectively. The results of this paper may provide a new theory reference for drafting critical traffic volume of traffic signal warrant.
Ma, Dongfang , Jilin University, China
Wang, Dianhai , Zhejiang University, China
Bie, Yiming , Advanced Transit Association, China
Tao, Pengfei , Jilin University, China
Transportation Research Board. 500 Fifth St. NW, Washington, D.C. 20001
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