The vehicle dynamics engineers can tweak different variables to create scientifically accurate tests. For example, a robot can go through the same winding road over and over again with different speeds, or it can drive on a straight road with different steering settings. The purpose of this is to test how much control the car has when going around corners at different speeds or when turning left or right at certain settings.
These are just two examples of what a vehicle dynamics engineer does. It is important for these engineers to know how cars work so they can develop new technology for vehicles and make sure that no one gets hurt in accidents that are caused by poor engineering design or lack of safety features.