Abstract
AbstractThe statistical models supporting the Highway Safety Manual quantify associations between aggregate traffic measures, such as average daily traffic volume or posted speed limit, and crash f...
Highlights
The Highway Safety Manual (HSM) (AASHTO 2010) offers evidence-based tools for predicting the safety effects of designrelated decisions
Macroscopic traffic flow models imply that vehicle headways should show a roughly convex relation to traffic density; headways tend to be long when densities are low because vehicles are widely separated, and headways tend to be long when densities are high because vehicles have slow speeds
Brill’s microscopic model of how a platoon of braking vehicles can produce a rear-end crash emphasizes the differences between reaction times and following times and shows how the probability of a crash occurring in a stopping wave can be computed via the first passage of a random walk
Summary
The Highway Safety Manual (HSM) (AASHTO 2010) offers evidence-based tools for predicting the safety effects of designrelated decisions.
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