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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 Research Program, aimed to develop methods to quantify the impact of vehicle mix on crash frequency and crash severity by facility type and develop a spreadsheet tool for practitioners to quantify the effect of vehicle mix on safety performance.
Supplemental to the report are NCHRP Web-Only Document 393: User’s Guide for Quantifying the Effects of Vehicle Mix on Crash Frequency and Crash Severity, Appendices A-D, an Implementation Memo, a Technical Brief, and a PowerPoint Presentation.
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