In the U.S. it's at least fairly common to see a posted prohibition against backing into a parking space. That sounds really silly - I always prefer to back into a parking place if I can, at the supermarket for example, so that I don't have to back out. (Or if there are two rows with a space open I'll drive through the other one so I'm facing out.)

Backing out in a car park can be quite a dangerous manoeuvre, especially if there are pedestrians around, and other cars backing out. Someone could get killed. Onn theb other hand the worst that can happen if you back into a space badly is that the cars might get dented. It's a pretty funny sense of priorities that "posted prohibition" seems to indicate.

I think the reference was to parking by the kerb (as we spell it). It's part of the driving test, but some people try to avoid it once they've passed the test.

I used to have a colleague who came from South Africa - she'd been driving for years, but she'd never learned to reverse to park by the kerb and had great difficulties picking up the skill to pass her test here. She said that back home there was always plenty of room, so noone did it. (That was nothing to do with being a woman.)