Automated traffic signal performance measures (ATSPMs) provide an alternative to traditional signal timing and have been shown to improve operations at signalized intersections by reducing split failures, arrivals on red, red-light running, and delays. Although not a fully adaptive solution, ATSPMs allow agencies to make near real-time signal timing adjustments based on field data, influencing the behavior of drivers, pedestrians, and bicyclists.
NCHRP Research Report 1170: Evaluating the Safety Effects of Automated Traffic Signal Performance Measures, from TRB's National Cooperative Highway Research Program, is designed to help transportation agencies quantify changes in crash frequency and severity associated with ATSPM deployment and develop crash modification factors. The report presents two methods for using crash modification factors (CMFs) to evaluate the safety effects of ATSPMs based on changes in signal timing or operation.
National Academies of Sciences, Engineering, and Medicine. 2026. Evaluating the Safety Effects of Automated Traffic Signal Performance Measures. Washington, DC: The National Academies Press.
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