A autonomous driving vehicle and system. Vehicle sensors, including cameras and microphones, detecting conditions around the vehicle and producing signals indicative of the conditions around the vehicle that are detected that represent the way that liquid in the environment is reacting to the vehicle. A computer drives the vehicle. The computer receives information from the sensors about a current way in which liquid in the environment interacts with parts of the vehicle, under current roadway conditions and compares that to information in a database to determine a dangerous roadway condition.