Decision-Making Guide for Traffic Signal Phasing (2020) / Chapter Skim
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55 9 Safety Considerations 9.1 Understanding the Safety Impacts Associated with Signal Phasing By one definition, signal phasing mode is the determination of allowable conflicts within an intersection, or in other words, the determination of which vehicle movements and/or pedestrian crossings may proceed concurrently. As such, signal phasing mode selection has a large impact on the safety of an intersection; inappropriate selection of a certain phasing mode could lead to an unreasonable safety risk.
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56 9.2.2 HSM Method – Quantitative Crash Prediction The HSM transitioned safety analysis from a reactive, descriptive analysis to a proactive, predictive analysis. Two of the predictive tools introduced in the HSM are SPFs and CMFs.
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57 9.3 New Research Research conducted as part of this project sought to develop new SPFs and CMFs to help answer several outstanding research questions. The research team used data from across the country to develop these new equations and values.
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From page 66... ...
58 Applying These CMFs As mentioned, the CMFs computed in this study are intersection-based, i.e., converting from permissiveonly to protected-only left-turn phase mode on the major road has an expected LTOPP crash reduction of 49.3% (1-0.507) for the intersection crashes.
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