1. Safety Evaluation of Transit Signal Priority with Bus Speed Volatility as a Surrogate Measure: Case Study in Minnesota
- Author
-
Song, Yu, Tse, Hoki, Lind, Eric M., Chitturi, Madhav V., and Noyce, David A.
- Subjects
Physics - Physics and Society - Abstract
Previous studies have found correlations between the implementation of transit signal priority (TSP) and the reduction in number of crashes. To further understand how TSP affects traffic safety, a more in-depth evaluation was carried out using detailed bus automatic vehicle location (AVL) data. The data was from Minneapolis-Saint Paul Metro Transit Bus Route 5, where TSP was implemented at 30 signalized intersections in early 2019. A surrogate safety measure, bus speed volatility (BSV), was used to estimate the safety effects of TSP, with a higher BSV indicating more safety risks. A regression analysis was carried out on 23,123 event-level observations, with event defined as a bus traversal of a TSP-equipped intersection. Results indicate that with a TSP request, BSV was significantly lower than without a TSP request, confirming the effectiveness of TSP in smoothing bus trips through intersections, thus reducing risks of bus collisions and passenger fall-overs.
- Published
- 2022
- Full Text
- View/download PDF