In Chiang Mai parking enforcement involves a giant chain getting stretched through a long line of bikes and you can't get it out until you either cut the lock (bad idea) or find a police officer, pay the bribe / fine (however you choose to look at it) and then you are on your way. To be fair Chiang Mai has plenty of parking for the most part so this isn't really an issue unless you are trying to park a car downtown, which is a stupid idea when taxis cost next to nothing.