Detector technology for demand responsive traffic signal control under mixed traffic conditions

In general, traffic signal control used at signalised intersections in Indonesia is Fixed Time Control (FTC). It shows good results in conditions where there is a little fluctuation in traffic demand. However, in time-varying traffic, FTC becomes inflexible and inefficient. This situation may trigger traffic congestion and lead to increased delays and air pollution. Demand Responsive Traffic Signal Control (DRTSC), such as Vehicle Actuated Control (VAC) and Adaptive Traffic Signal Control (ATSC), have been introduced to overcome these problems. However, all the available demand responsive traffic signal control methods have been developed for non-mixed traffic conditions. The objectives of this literature review was to investigate the traffic parameter for input data of DRTSC under mixed traffic conditions and to identify the most suitable detector technology for providing traffic information to DRTSC under mixed traffic conditions. Based on the extensive literature review on the traffic signal control strategies and the detector technologies, queue length (meter) and occupancy rate (%) provided by VIP system are the most suitable input data for a DRTSC under mixed traffic conditions.