[bluGill]

A bus is already slower than my car because of the need to stop to let others on. Plus a bus is much less likely to take a direct route to where I want to be thus requiring me to go someplace I don't want to go just to transfer to a different bus to get there. Finally when I drive i often am on faster roads that a bus wouldn't be on because there is nobody else to pick up (unless I transferred to an express bus)

Most people, throughout history have had a fixed time budget to get to work. They move if the trip takes more than half an hour. They will not take jobs (or will move) if it is farther away. We see this across civilizations, from hunter gathers following herds to modern people. There are exceptions but they are exceptions.