This report describes a study of the effects of a Scandinavian-style law concerning alcohol-impaired driving. The past two decades have seen the adoption throughout most of the developed world of drinking-and-driving laws based on principles originally developed in Norway and Sweden. The French law of July 12, 1978, was a part of this general development. Interrupted time-series analysis of French data on crash-related injuries and fatalities shows that the 1978 law had a notable deterrent effect, but that the effect was not permanent.
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