SCATS adaptive traffic system control is designed to improve mobility on congested corridors with variable demand but not as a tool to improve transit performance. However, many urban corridors are heavily used by transit routes. Hence, it is important to determine how SCATS affects transit performance on heavily used transit corridors. This research presents the first joint evaluation of SCATS and TSP (transit signal priority). The case study is based on before and after traffic and transit data along Powell Boulevard, one of the most congested urban arterial in the Portland, Oregon, metropolitan region. Utilizing permanent traffic data collection stations, bus automated vehicle location (AVL) and automatic passenger count (APC) data, and transit signal priority request, this work presents the results of statistical tests and regressions to determine SCATS impacts. Statistically significant differences were observed in terms of travel times and SCATS related regression parameters. Overall, the travel time changes or improvements related to SCATS seem to depend greatly on the direction of travel and the time of day.
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