It's hard to recall exactly where I've seen them, but I think typically only in lots where either the lot is very congested (like airport parking garages) or wh

It's hard to recall exactly where I've seen them, but I think typically only in lots where either the lot is very congested (like airport parking garages) or where spots and aisles are very tight (making backing in a more difficult maneuver). In my experience, drivers in the US at least are not very good at backing their cars up. I feel like the likelihood of an average driver in my area hitting a car parked next to them while trying to back into a spot would be quite high. Also, when I do see cars who backed into spots, they often did a very poor job of it and are not centered within the spot, making the spot next to them even more tight or sometimes unusable. I do agree that backing out of a spot feels very dangerous (even more so as I get older), especially when sandwiched between 2 large vehicles. Personally I try to counteract that by checking everything I can see multiple times and then backing out very slowly, giving me additional opportunity to keep checking mirrors and also giving others a chance to signal me. I generally do not back into spots for other reasons mentioned in this thread - it's just not common around here and so others do not expect it and so they pull up too close behind you before you start to reverse, and also it limits access to the rear of the car for loading up purchases.