On 1 March 1998 the Danish per se limit was lowered from 0.08 per cent to 0.05 per cent BAC for drivers of motorised vehicles. Based on accident data and drivers drinking habits before and after the change, the effect of the new limit has been evaluated, knowing that a 10-month period is too short time for making sufficient estimations. Questions on drivers attitudes to DUI showed remarkably decreases in the number of drinks, which they allow themselves to drink during the last two hours before driving. In total, the proportion of drivers who would not drink at all or drink only one drink increased from 71 per cent before the change to 80 per cent after the change. The answer most often given of those who had changed their drinking habits seemed to be related to the lower limit. However, the change in drinking habits has not resulted in a marked decrease in neither the proportion of injury accidents nor the proportion of DUI injury accidents with drivers of motor vehicles.