Control of Congestion in Highly Saturated Networks: Survey Design and Data Collection

This working paper describes the initial stages of a tlfollow-uptl study of the control of highly saturated signalised junctions in Bangkok. The previous study has been reported in WP 220, WP 221 and WP 222. This paper describes why particular junctions were chosen for this second study and reports on the results of a survey designed to produce the data input requirements for TRRL1s TRANSYT program. TRANSYT is a method of finding the "bestt1 fixed-time plans with which to co-ordinate the traffic signals in any network of roads for which the average traffic flows are known. While this paper deals with the data input requirements, such as average flows, the results of an experiment comparing TRANSYT recommended signal timings with Traffic Police control will be described in a subsequent paper (WP 251).