Any parent will know how difficult it is to manoeuvre yourself and at least one child out of and into a car, often with a trolley nearby, in a regular-sized parking space.
This is why most supermarket car parks have designated, larger, spaces for people shopping with children. These bays allow parents to safely buckle little ones into car seats and fold a pram or buggy, among other things.
The spaces are also closer to store entrances, so you don't have far to walk with youngsters in tow.