Intersection Crash Prediction Methods for the Highway Safety Manual (2021) / Chapter Skim
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Pages 16-19
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From page 16... ...
16 Summary The first edition of the HSM included safety performance functions (SPFs) for roadway segments and intersections.
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17 Rural Three-Leg Intersections with Signal Control • Three-leg signalized intersections on rural two-lane highways - Total crashes • Three-leg signalized intersections on rural multilane highways - Total crashes - FI crashes Intersections on High-Speed Urban and Suburban Arterials • Three-leg stop-controlled intersections on high-speed urban and suburban arterials - Multiple-vehicle (MV) total crashes - MV FI crashes - MV PDO crashes - Single-vehicle (SV)
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18 Five-Leg Intersections with Signal Control • Five-leg signalized intersections on urban and suburban arterials - MV total crashes - MV FI crashes - MV PDO crashes - SV total crashes - SV FI crashes - SV PDO crashes Three-Leg Intersections Where the Through Movement Makes a Turning Maneuver at the Intersection • Three-leg turning intersections on rural two-lane highways - Total crashes • Three-leg turning intersections on urban and suburban arterials - MV total crashes - MV FI crashes - MV PDO crashes - SV total crashes - SV PDO crashes Crossroad Ramp Terminals at Single-Point Diamond Interchanges • Crossroad ramp terminals at single-point diamond interchanges - FI crashes - PDO crashes Crossroad Ramp Terminals at Tight Diamond Interchanges • Crossroad ramp terminals at tight diamond interchanges - FI crashes - PDO crashes In addition to formulating new SPFs, development of SDFs for the new intersection configurations and traffic control types was explored for potential use in combination with the SPFs to estimate crash severity as a function of geometric design elements and traffic control features. However, due to challenges and inconsistencies in developing and interpreting the SDFs, it is recommended for the second edition of the HSM that crash severity for the new intersection configurations and traffic control types be addressed in a manner consistent with existing methods in Chapters 10, 11, and 12 of the first edition of the HSM, without use of SDFs.
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From page 19... ...
19 Project 17-38 were updated to incorporate the new intersection crash prediction models developed as part of this research including intersections with all-way stop control, three-leg intersections with signal control on rural highways, intersections on high-speed urban and suburban arterials, five-leg intersections, and three-leg intersections where the through movement makes a turning maneuver at the intersection; and an unlocked version of the Enhanced Interchange Safety Analysis Tool (ISATe) that includes a module for ramp terminals and excludes modules for freeways and ramps was modified to incorporate the new crash prediction models for ramp terminals at single-point diamond interchanges and tight diamond interchanges.
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