The interest in in-vehicle Advanced Driver Assistance Systems(ADAS) is increasing. New systems such as Adaptive Cruise Controlsand Collision Avoidance Systems are currently introduced at a rapidpace. To exploit the full potential of these systems it is necessary to es-timate the systems future impact already at early development stages.This paper introduces a traffic simulation framework for analysis ofthe effects of ADAS on the traffic system. The framework considersboth the system functionalities of the ADAS as well as behaviouralchanges of drivers in equipped vehicles. Such behavioural changeshave usually not been considered in previous traffic simulation studiesof ADAS. Application of the simulation framework is exemplified bytwo studies of ADAS that assist drivers on two-lane highways