Automotive radars must operate in complex and dynamic environments where interactions with the host vehicle and its surroundings can have a significant impact on the performance of the radar system. In particular, the material properties of the vehicle fascia and the location of the radar behind the fascia can impact performance. Radar designers and system integrators also need to understand how the radar will perform under varying traffic and weather conditions. As automotive radar systems mature, it is important to understand complex scattering mechanisms in different environments and for different objects encountered on the road.