TRANSYT/10 USER GUIDE

TRANSYT is an off-line computer program for determining and studying optimum fixed-time, coordinated, traffic signal timings in any network of roads for which the average traffic flows are known. A traffic model of the network calculates a Performance Index (PI) in monetary terms, which is a weighted sum of all vehicle delays and stops. An optimising routine systematically alters signal offsets and/or allocation of green times to search for the timings which reduce the PI to a minimum value. TRANSYT is the most widely used program of its type throughout the world. This manual provides a comprehensive user guide to the latest version of the TRANSYT software suite issued by the Transport Research Laboratory. It incorporates and updates the contents of two reports detailing earlier versions (Version 8: LR 888, Version 9: AG 8). It also explains an entirely new feature to model flared approaches, which are particularly important at signalised roundabouts. (A)