Evaluation of Advanced Traffic Control Systems

On Powell there are two systems operating concurrently: a demandresponsive traffic signal system called Sydney Coordinated Adaptive Traffic System (SCATS) and a Transit Signal Priority (TSP) system. The TSP in the Portland metro region is designed to give priority to late buses and to boost transit performance. In previous studies, Figliozzi’s research team analyzed a multitude of factors on Powell Boulevard including traffic congestion, transit times, air quality and cyclists’ intake of air pollutants, and a before-and-after evaluation of SCATS.