Sometimes Munro lets the desire to make a joke get in the way of making a good point.
Your self driving car is equipped with sensors giving an all round view a human can only dream of, and it has GPS. A long term solution is likely to involve a call centre type system in which a car which runs into a problem will stop and ask for a human operator. This could be everything from passengers throwing up to malicious people deliberately standing in front of the car. In the first case they have the photos and your credit cards; in the second, someone can call the police. Instead of a taxi despatcher contacting a number of drivers, a taxi despatcher will talk directly to the cars.
How old are you? Under 45 I guess.
Rail to the home is not going to happen, and self driving cars are a major prospect to improve the life of the elderly and disabled, as well as solving the problems of getting children to school safely.
Getting people to get enough exercise is all very well but it is inappropriate for quite a lot of people.