In fact to the speed point I've had a dream that working autonomous vehicles would reduce average speed. This improves efficiency and safety across the board.
Don't laugh, it could work... When your car is an extension of your living room or office do you mind slightly longer travel times? Sure you have to leave 10 minutes earlier but you can just pick up your console game in your car.
* Breathalyzer - I'll give you this one
* Seat Belt interlock - seatbelts save lives just as well in an autonomous vehicle
* Speed - Speed kills passengers and pedestrians just a well in an autonomous vehicle