Crash Modification Factors in the Highway Safety Manual: A Review (2023) / Chapter Skim
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Pages 27-28
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27 Identification of Adjustment Factors for SPFs Estimated in NCHRP Project 17-62 6.1 Background NCHRP 1762, "Improved Prediction Models for Crash Types and Crash Severities," estimated base SPFs for segments and intersections on rural twolane roads, rural multilane roads, and urban and suburban arterials (Ivan et al.
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From page 28... ...
28 Crash Modification Factors in the Highway Safety Manual: A Review • Install passing or climbing lane on rural twolane segments; • Install a short fourlane section on rural twolane segments; • Modify lane width on rural twolane undivided segments; • Modify horizontal curvature on rural twolane undivided segments; • Modify driveway density on rural twolane undivided segments; • Improve roadside on rural twolane undivided segments; • Install TWLTLs on rural twolane undivided segments; and • Install shoulder or centerline rumble strips on rural or urban twolane undivided segments. For intersections, CMFs could be identified for the following intersection design elements or traffic control features: • Leftturn bay, • Rightturn bay, • Skew angle, • Enforcement of redlightrunning cameras, • Prohibition of right turn on red, and • Intersection lighting.
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