alt Hacker NewsCars and personal computers have advantages over shared resources that often make them worth the cost. If you want your transport/compute in busy times you may find limitations. (ever got on the train and had to stand because there are no seats? Every had to wait for your compute job to start because they are all busy? Both of these have happened to me).
I ran the numbers, and for most non-braindead cities something like a fleet of 6-seater minivans will easily replace all of local transit.
And with just 6 people the overhead if an imperfect route and additional stops will be measured in minutes.
And of course, it's pretty easy to imagine an option to pay a bit more for a fully personal route.