This paper examines the determinants of truck accidents in the United States using a time series data set covering the period 1970-2001. Econometric models are developed and subjected to a set of specification error tests so as to increase the probability of selecting models which are statistically reliable. Along with conventional factors affecting motor vehicle accidents, the effect of the Motor Carrier Act of 1980, which deregulated the trucking industry, is examined for its effect on truck accidents. In addition, the model accounts for the effect railroad freight mileage has on truck accidents. Empirical results show that alcohol consumption, the unemployment rate, and railroad freight activity had a significant effect on truck accidents. However, deregulation of the trucking industry did not have a statistically significant adverse effect on these accidents.
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