There's quite a process involved with switching from single meters to a pay station -- typically an ordinance change has to be proposed and a public hearing conducted. These are usually covered by the local papers, though perhaps in LA it's not on the front page. Then it goes to a vote by the governing body, the city council or such, and notices are posted in various places: city hall, website, etc.That's why when one user here said "you don't have a very strong case" and another says "you don't have a case at all" I'd like to know why they think that.
So if you LIVE in LA, you're responsible for knowing the city ordinances. If you don't live in LA, you *might* see some lenience, but don't count on it.