The report focused on 11 companies that have been testing more than one hundred self-driving vehicles on public roads – mostly in the Silicon Valley area. Data includes safety-related incidents and tracked disengagement events. Disengagement refers to how many times a human has to take back control of the vehicle while it’s on the road for safety reasons.Among the notable statistics the report showed were Google’s self-driving vehicle, Waymo. The vehicle recorded an average of two incidents per 16,093 km (10,000 mi)—mostly due to construction, emergency vehicles or debris on the roads, and weather conditions. It’s a significant drop from last year’s statistics, where they saw eight disengagements covering the same distance.