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Publication Number: FHWA-RD-99-207
Prediction of the Expected Safety Performance of Rural Two-Lane Highways
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This report documents the algorithm for predicting the safety performance of rural two-lane highways that forms the basis for the Crash Prediction Module of the Interactive Highway Safety Design Model. The algorithm estimates the effect on safety performance of roadway segment parameters including lane width, shoulder width, shoulder type, horizontal curves, grades, driveway density, two-way left-turn lanes, passing lanes, and roadside design, and of intersection parameters including skew angle, traffic control, exclusive left- and right-turn lanes, sight distance, and driveways. The algorithm enables highway agencies to estimate the safety performance of existing or proposed highways and to compare the expected safety performance of geometric design alternatives.
Michael F. Trentacoste
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Form DOT F 1700.7 (8-72) Reproduction of completed page authorized
Topics: research, safety, local & rural road safety, intersection safety
Keywords: research, safety, accident modeling, two-lane highways, roadway segments, accident prediction, geometric design, Empirical Bayes estimation, at-grade intersections
TRT Terms: Traffic safety--Mathematical models, Traffic accidents--Mathematical models, Rural roads--Safety measures, Two lane highways, Accident data, Highway safety