Driving after drinking alcohol is a major cause of death and injury on the roads. Alcohol impairs many of the functions necessary for safe driving, for example decreasing motor skills and reducing reaction time. There have been sustained enforcement and education efforts in the UK to prevent drink driving. Alongside these efforts, there has been a substantial decline in the number of alcohol-related deaths and injuries since the late 1970s. The majority of people now consider drink driving to be socially unacceptable, and self-report surveys consistently demonstrate that drink driving is a major road safety concern for respondents.