Perhaps some of the best known and most established alcohol harm reduction approaches are those that aim to prevent drunk driving. These interventions target a specific high-risk behaviour (driving when intoxicated) by deterring the use of cars – through blood alcohol limits, the enforcement of legislation, awareness campaigns, improving or extending public transport services, and designated driver schemes (where one member of a group of drinkers is encouraged to remain sober and transport the others). This section includes an international manual on the topic from the Global Road Safety Partnership, as well as evidence reviews and guidelines for developing new schemes.