Just to note that with parallel parking spaces of the typical 2.4m width, there is requirement to allow an extra 300mm clearance into each adjoining car space to allow for the swing of car doors. It’s not for the whole length of the parking space but it does means you have to be a bit careful where any fixtures or “obstructions” are placed. AS 2890.1 is the standard.
I wonder too, when placing a fixture along a lot boundary, or very close to it, if it can become a bit like a fence or a wall? Sure, the fixture will belong to the owner of the lot in which it’s placed. But my street is full of examples of walls that are wholly on one side of a boundary where the non-owners have painted and even attached fixtures to their side of it. It seems to be allowed as long as no damage is done.
I’m maybe other thinking this for a strata car park !!