Bikes can actually be better for people with mobility issues than cars. Biking is pretty low impact and uses less energy than walking, so for some people for whom walking is a challenge, biking might be possible. With safe bike infrastructure, these people can still get around without cars. As a bonus, the exercise will keep them mobile longer.<p>&gt; There&#x27;s lots of people like my father, old, handicapped, both, how do you design a mass transit system that can accommodate people like him?<p>You build an ADA compliant system. Compare the NYC subway, built long before the ADA, and the DC Metro. Except when elevators are broken (a big problem given WMATA&#x27;s incompetent stewardship of the system), you can use pretty much the entire DC metro system in a wheelchair. Escalators are in every station. In Japan IIRC there were markings in the walkways of train stations, airports, and sidewalks to help the blind navigate, and we could incorporate that in the States.