The Road Generator is the graphical user interface for defining road networks and sophisticated road features. Roads can be assembled from geometric segments or imported. Features such as lanes, intersections, height, inclination, surface condition, etc. can easily be added to a road by editing attributes that are displayed in 1-D diagrams. The whole road network is visualized in a 2-D view. The road design also interacts closely with the 3-D animation software MotionDesk to define the environment. The Road Generator gives ideal support to complex traffic scenario creation in the development and testing of advanced driver assistance systems (ADAS).