[ItsDeathball]

Tokyo manages this problem before it ever becomes a problem: you can't register your car to a Tokyo address unless you can prove you have a parking spot. It could be a spot in your front yard (in this case probably the entire yard) or a rented space in a parking garage. If you can't afford a parking spot at market rate, then you can't afford a car.

[SECProto]

More than that, registration is actually a national requirement for full sized cars (kei's don't need a registered spot). And the country as a whole generally does not have street parking. Conjoined, means that illegal/congested streets from parking isn't an issue