[en] Within the German Research Initiative INVENT, the partial project „Verkehrliche Wirkung, Recht und Akzeptanz (VRA)“ deals with traffic effects, legal aspects, acceptance and economics of driver assistance systems. This presentation gives examples for the consulting services of VRA as well as for the early simulations of a driver assistance system. Such simulations vary in scale from basic functions over driving situations and traffic situations to traffic scenarios. Results are presented for the basic functions and driving situations for a stop-and-go extension of adaptive cruise control.