One of the main tasks of PRO-GENERAL (as a subprogramme of PROMETHEUS) is to design traffic control systems using new technologies, at the functional level and from the traffic-engineering point of view. Accordingly, the industrial companies involved described more than 20 functions as a basis of further work. The PROMETHEUS Safety Group selected some functions which seemed to have a noticeable impact on road traffic safety. Under consideration of different accident databases (e.g., indepth-study data), an assessment was made of the potential accident reduction which could be gained from the designed PROMETHEUS functions. Starting from the assumption of perfect functions, some of the functions showed relatively great effectiveness in terms of accident reduction. On the other hand, some functions which seemed to be useful will have only a very small impact on road safety. If real traffic and road situations (and real drivers) are taken into account the assessed benefits will diminish considerably.