There is significant added risk. Failure to observe traffic rules by a subset of vehicles means that the drivers - human or otherwise - have to guess the inte

There is significant added risk. Failure to observe traffic rules by a subset of vehicles means that the drivers - human or otherwise - have to guess the intention and actions of vehicles with less information, and greater uncertainty. A driver rolling through an all-way stop intersection is a threat to other vehicles, as it is not signalling it's intention to abide by the round-robin rule of all-way stops, e.g. And frankly, in the case of Tesla autopilot, the vehicle is not autonomous, and the responsible party for the motion of the vehicle is still the operator, regardless of how much the computers are doing on their behalf. Under these circumstances, correct observation of traffic laws is mandatory.