Crash prediction analysis focuses on identifying attributes that result in traffic crashes and proposes effective countermeasures to improve the roadway design and operational attributes. These crash frequency models are typically employed for examining crash counts either at the micro- (intersection or segment) or the macro-level (county or traffic analysis zone). NCHRP Research Report 1103: The Effect of Vehicle Mix on Crash Frequency and Crash Severity , from TRB’s National Cooperative Highway Re…