Comment by numpad0

IANAL anywhere, but the actual law[1] is a blanket ban on roadside parking as means of storage. The blurbs around overnight and proofs are just implementation details. Both the spirit and the reality is no one shall leave cars on curbs. I believe this includes privately owned access roads due to technicality combos with building codes that require roads adjoining properties for fire safety reasons(but sort of inexplicably not driveways).

Anyways, the point is, it actually is a nationwide prohibition of curbside parking as a car ownership strategy, and vast majority do comply with it.

1: https://laws.e-gov.go.jp/law/337AC0000000145/