Roadside sobriety checkpoints are an intervention in which law enforcement officers stop passing vehicles to check whether drivers are impaired. Although there is evidence that a program of roadside sobriety checkpoints is an effective approach to reducing alcohol-involved motor vehicle crashes, less is known about the duration of time over which individual roadside sobriety checkpoints are associated with such crashes. This study, led by past PISC trainee Christopher Morrison and involving PISC Executive Director Douglas Wiebe and PISC Senior Scholar Charles C. Branas, used autoregressive integrated moving average analyses in order to conclude that fewer alcohol-involved motor vehicle crashes occurred when there were more roadside sobriety checkpoints over the previous 4 days, 5 days, 6 days, 7 days, and 1 week.
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