There is also the question of trust, one of the biggest non-technical challenge to overcome would be to convince general public to get into a car which doesn't

There is also the question of trust, one of the biggest non-technical challenge to overcome would be to convince general public to get into a car which doesn't have a driver. It would be similar to getting into a rollercoaster. No control whatsoever of what might happen next despite every bit of your trip being pre-planned to the dot.