Abstract
The legal limit for drinking and driving in Britain is 80 mg /dl of alcohol in the blood. This was chosen 20 years ago on the basis of studies that have been recently re-analysed. Changes in opinion, recent research and the evaluation of other countermeasures such as random breath testing show that there are good reasons for revising the legal limit downwards to 50 mg /dl and that random breath testing is introduced as in most Nordic countries.