A survey was made of driving habits of 103 epileptic patients who, having suffered a seizure, were picked up by the Wellington Free Ambulance Service. It was found that 21 (20%) subjects were driving a motor vehicle--for nine this was necessary for their employment; 57% of drivers with epilepsy reported that the Ministry of Transport had not been informed of their epilepsy. For three subjects a driving accident was a direct result of their seizure. Forty-three percent of subjects in this study claimed never to have had any professional advice about driving. Of the 21 subjects who continued to drive, 13 were receiving inadequate drug therapy at the time of seizure. Advice and drug therapy for epileptic patients therefore required regular review. We consider that the Ministry of Transport should issue a simple statement about epilepsy and driving which should explain the law, risks, precipitating factors for epilepsy, and the need for good drug control. This should be issued to doctors and also be available for those applying for a driving licence.