While China represents the largest market for car sales, carmakers are more focused on the US, the number two market, for regulatory guidance on how this will play out. The biggest hint so far came in a recent letter from Paul A. Hemmersbaugh, Chief Counsel at the US National Highway Traffic Safety Administration (NHTSA), to Dr Chris Urmson, Director, Google’s Self-Driving Car Project. In the letter NHTSA states, “If no human occupant of the vehicle can actually drive the vehicle, it is more reasonable to identify the driver as whatever (as opposed to whoever) is doing the driving.” Effectively, US law will treat the car’s software as the driver. This could, over time, shift the emphasis on personal liability to another segment of the law. It also suggests that if the driver is in a position to avoid an accident by taking the controls, then they might ultimately be liable — Google’s cars, unlike other manufacturers, don’t have steering wheels and brake pedals at all.