Citation

Chakraborty P, Sarkar A. Indian Highw. 1997; 25(12): 15-25.

Copyright

(Copyright © 1997, Indian Roads Congress)

DOI

unavailable

PMID

unavailable

Abstract

This paper presents a study of how to develop a fuzzy logic controller for a crossroads of two one-way streets with random vehicle arrivals at a rate uniform in time. The study did not consider the case of a traffic controller which can be used for different types of junctions with different volumes; investigation of this case would be feasible but require modelling and simulation of the traffic flows. A simple methodology was used to estimate the delays in each road entering the junction. It was assumed that an efficient vehicle-actuated mechanism would be installed to implement the fuzzy logic controller. 25 fuzzy logic rules were formulated, with five rules for each of up to five possible interventions during a green period. In each case, the five rules were used simultaneously to decide on the control action. Computer programs were developed in the C programming language, to apply fuzzy set logic to a simple intersection, using the study's methodology. The results, obtained while implementing a specific example, showed that the delays achieved by the controller were usually 80-90% of those obtained from optimal fixed-time traffic signal settings, based on Webster's formulae. The author considers that there is enormous scope for further work in applying fuzzy set theory to traffic signal controllers.