SMADIT - Joint Action against Alcohol and Drugs in Traffic - is a collaborative project in Stockholm County involving the Swedish Road Administration, the Police Authority, Stockholm County Council, the Association of Local Authorities in Stockholm County, Stockholm City, the Swedish Prison and Probation Service, and the County Administrative Board. The aim of the project is to set up fast procedures, so that drivers under the influence of alcohol or drugs who are resident in Stockholm County ("SMADIT customers") are offered, within 24 hours, a consultation regarding the chances of receiving treatment for alcohol or drug dependence, i.e. they receive a SMADIT offer. This report is an evaluation of the trial scheme in Stockholm County over the period 2003-2005. The project comprises specific activity objectives, process objectives and information objectives which have been evaluated using statistics concerning the entire project, a questionnaire study and an interview study.The activity objectives concern the suspected drink drivers who had been stopped by the police, offered consultation with the Treatment Centre for Alcohol and/or Drug Addicts, and received treatment. In 2004, there were 91 SMADIT customers who had been offered treatment, who were assessed by specialist physicians, and 50 who continued treatment. In 2005 there were 146 persons who had been offered treatment, who were assessed by specialist physicians, and 88 who continued treatment. The police had made far too few breathalyser tests in Stockholm County, and therefore the objective regarding the number of SMADIT customers could not be achieved. The SMADIT offers made to drivers who had been stopped and suspected of being under the influence of alcohol or drugs had also been slightly too few in number, and there had also been too few SMADIT customers who were motivated to accept the offer of consultation.