Recently, various traffic problems, such as traffic jams, air pollution due to exhaust gas and accidents, often occur on roads mainly in urban areas. To solve these problems, intelligent traffic signal (ITS) control systems have been studied and developed by various organizations. However, even if an excellent control system is used, the system must be operated according to actual on-site traffic conditions, to make the most of the features and functions of the system. The signal control methods currently in wide operation consist mainly of an automatic pattern selection control mode and an automatic adaptation control mode. This paper describes the functions and the optimum operating settings of each control mode based on the results of analyzing the responses of the signal control systems to traffic variations in simulation experiments. (A*)
Abstract