Citation needed.

People who drive cars usually have a need for them. Cargo hauling for example.

> Two train stations in the entire city.

Probably wasn't a large city. I've been to some really small cities that had two train stations. You could walk between stations.

> A car or two in every driveway

For the most part, Japan doesn't have driveways. Even in less populated centers, they might have a parking space, or a garage, but not a driveway. It's a waste of space. Even street parking is limited. Some people may have two cars for whatever reason but I doubt that is the norm.

I'm wonder what region you were at that saw this many cars.

Interestingly, the number of cars in Japan is roughly the same as the number of bikes in circulation.