Two-lane rural highways safety performance functions.
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2016-05-01
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Abstract:This report documents findings from a comprehensive set of safety performance functions developed for the entire
state two-lane rural highway system in Washington. The findings indicate that random parameter models and
heterogeneous negative binomial models with dispersion parameter models as functions of roadside variables are
effective in capturing the simultaneous impact of roadway and roadside geometrics on two-lane rural roadway safety
performance. This study underscores the importance and utility of roadside data inventories in safety performance
function development.
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