United States Department of Transportation
i
Safety Performance Analysis of TSMO: A Practical Approach for Assessing Traffic Signal Coordination Effects on Crash Probability and Severity
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2019-11-01
[PDF-2.12 MB]
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Abstract:The Federal Highway Administration (FHWA) Office of Safety, in cooperation with the Highway Safety Manual (HSM) Implementation Pooled Fund Study, recently completed a safety analysis needs assessment for TSMO. The safety analysis needs assessment characterized the current state of practice, knowledge, and skills for quantifying the safety performance effects of TSMO. It also identified gaps in the existing body of knowledge and corresponding needs, which will provide the foundation for future research activities and advancements in practice. One group of needs focused on exploring sub-annual safety data collection and analysis methods to address the dynamic conditions under which TSMO strategies operate. This document presents one such sub-annual analysis method: probabilistic models of crash occurrence and severity to estimate how the characteristics of vehicle arrivals in relation to traffic signal timing affect safety performance at a signalized intersection. The analysis method is presented in the context of evaluating the effects of traffic signal coordination on the occurrence and severity of common intersection crash types. Little is known to date on the safety performance impacts of traffic signal timing due to the inability of commonly used annual analysis methods to capture the microscopic variability in traffic signal timing plans, vehicle arrivals, and resulting safety performance over the course of a day. The method in this document is a shorter-term analysis option (e.g., 15-minute time periods). The analysis focuses on rear-end and right-angle crashes, as those are common intersection crash types assumed to be affected by traffic signal timing. The results of the analysis are models that relate the probability of these crash types and their severity on a signalized intersection approach to the characteristics of vehicle arrivals in relation to traffic signal timing on that same intersection approach.
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