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During which month is it riskiest to drive in the United States?

In: Traffic Injury Prevention. Vol. 10, issue 4 (Aug. 2009), p. 348-349.

Authors: Michael Sivak.

Objectives: This study examined the variation in the U.S. road fatality rate per distance driven across the months of the year. Method: The monthly fatality rates were analyzed for a 13-year period from 1994 through 2006. Results: The results indicate a systematic seasonal variation in the road fatality rate, with the highest rate in October and the lowest rate in March. Conclusion: The obtained seasonal variation in the road fatality rate is likely a result of a joint influence of several factors that exhibit seasonal variations themselves (the duration of darkness, consumption of alcohol, proportion of older drivers, amount of leisure driving, and inclement weather).