Like any other motor vehicle accident, driverless vehicles can cause collisions that result in serious injury or even death. Driverless vehicles have only been on the roads for a short period of time and the number of self-driving cars is only a small fraction of all vehicles on the road. However, there have been a number of accidents involving driverless vehicles and some fatalities. There have been at least 4 known fatalities in vehicles using self-driving systems.