The Road Weather Information Service is a Traffic Information Service in Finland that started in winter 1997-1998. The service provides drivers with forecasts on road and weather conditions on winter between October and March. The forecasts are based on road conditions and weather. Also the maintenance actions are taken into account in deciding the classification. The information is presented in systemised way on national television and radio in connection of weather forecasts. The primary aim of the Road Weather Information Service is to provide drivers continual updates on road conditions for improving the safety. With the help of the service the drivers can also estimate the conditions in advance or time at journey and then for example reserve more time for their journey or even change their mode of travel. The service has been evaluated after each winter to see the effects of the service. The main result was that the service was well recognised around 90 per cent of the interviewees recognised the service. The road users estimated that the effect of the Road Weather service on their own behaviour was notable. For example, after the first winter 63 per cent of interviewees said that road weather had a strong or very strong influence on their time reserved for the journey. Furthermore, 71 per cent of interviewees said that the information had influence on their driving. (A). For the covering abstract of the conference see ITRD E212110.