If your car fits, it's a parking space.
If your car doesn't fit, double park.
Single yellow lines, double yellow lines, and large signs saying "no parking" are often invisible.
If you don't want cars parking on a kerb, you need to put a physical barrier in their way.
Anywhere can be turned into a legitimate parking spot if you put your hazard lights on.
It's quite entertaining to watch, in its way.