Citation

Kumar V, Rao S. Indian Highw. 1996; 24(10): 27-33.

Copyright

(Copyright © 1996, Indian Roads Congress)

DOI

unavailable

PMID

unavailable

Abstract

This paper presents a simulation study of the effect of different gap acceptance models on delays to drivers at stop-controlled T-junctions. Its first part surveys previous gap acceptance models, including the constant gap acceptance model, and models assuming consistent and/or inconsistent behaviour of drivers assessing gaps in traffic. A computer model was formulated to simulate the traffic flow and driver characteristics at priority T-junctions. It outputs the delays and queue lengths of minor road vehicles. The results were in moderate agreement with Tanner's delay values and much better agreement with Ashworth's delay values. Several simulation runs were made to investigate the effect of various other gap acceptance models on delays. Graphs of some of the results are given for the cases of normally and log-normally distributed gaps. It was found that the constant and pure inconsistency gap acceptance models gave almost the same delays to minor road drivers, irrespective of the volumes and distribution of acceptable gaps. This was also true of the pure consistency and inconsistent inconsistency models of gap acceptance. The inconsistent consistency model seems to be most represntative of typical driver behaviour, and its delays can be accurately estimated by the pure consistency model.