It's not hard to enforce the rule "don't park on places marked as not-for-parking". In fact it's quite easy. The problem is mainly that nobody tries actually en

It's not hard to enforce the rule "don't park on places marked as not-for-parking". In fact it's quite easy. The problem is mainly that nobody tries actually enforcing them with sufficient strength, because they get pushback. In my city, they were having huge problems with parking on the sidewalk, in bike lanes, during no-street-parking times, etcetera. How'd they solve it? First they started giving out $120 tickets. Then they started doing immediate towings on the arterial streets. Amazingly, people suddenly learned not to park on the street when and where they weren't supposed to.