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Heavy vehicle traffic and vehicle mix have a substantial impact on crash frequency and severity. The consideration of vehicle mix would improve predictive methods for crash frequency and severity. Improved methods will result in better use of the limited funds and resources available for improving the safety of the highway system and supporting performance-based approaches.
NCHRP Web-Only Document 393: User’s Guide for Quantifying the Effects of Vehicle Mix on Crash Frequency and Crash Severity, from TRB's National Cooperative Highway Research Program, develops and validates a statistically valid predictive methodology to quantify the effect of vehicle mix on crash frequency and severity for various facility types, and develops a spreadsheet tool for practitioners to quantify the effect of vehicle mix.
The report is supplemental to NCHRP Research Report 1103: The Effect of Vehicle Mix on Crash Frequency and Crash Severity.
Supplemental to the document are three spreadsheet tools and 24 datasets across six facilities (note: tools downloaded before March 11, 2024 should be replaced with these current, updated ones).
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