An Empirical Analysis of Fatality Rates for Large Truck–involved Crashes on Interstate Highways

Document Type

Conference Proceeding

Publication Date



large trucks, freight transportation, vehicle-mile travelled, ton-mileage, random parameters tobit model


Few studies have analyzed the impacts of freight movements (large truck) on crash rates. This study explores a novel application of a method to large truck movements, namely the random parameters tobit regression model, by examining crash rates (instead of frequencies) in truckmiles traveled and ton-miles of freight in the United States (US) as continuous censored variables. Using a nationwide crash database, the empirical results illustrate that the random-parameters tobit regression model provides an increase understanding of the factors determining large truck crash rates.

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Citation / Publisher Attribution

Presented at the 3rd International Conference on Road Safety and Simulation on September, 2011 in Indianapolis, IN.