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Selective enforcement can be a big problem in lots of areas, especially anywhere where race or class come into play.

The flipside is that if people gradually move into parking overnight in industrial areas, and nobody there cares, then homeowners are happy and people saying in their vehicles still have a (perhaps less convenient) place to go. Yet trying to get a rule passed explicitly allowing that in areas zoned industrial would be a lot harder than a rule that sort of evolves on its own.