[GhostVII]

It says if they have posted signs with the law, they can contact the police to issue a ticket (and tow, presumably). The formatting is a bit messed up, but you are required to both have the signs, and contact the police, you can't just tow it without calling the police, and require the owner to pay for the tow.

[querulous]

typically, the requirement is that you register the tow with the police (after the fact), not that you ask their permission before you tow

[tracker1]

Depends on the city in question.