
I guess-I am aware of my surroundings (look everywhere for any people). It didn't occur to me to honk.
On my new van I have a warning signal that alerts me if there is something behind me.
I do not always hold my hands children in the parking lot--but I'll be darned if I will do my nails--read a newspaper (sarcasm here!) while walking in the lot with my little ones.
I did the horn thing 2 times once in high school and once in a grocery store parkin glot in the last year. It did not prevent another car from backing into me in either case.
I think some are immune to horns. (actually the grocery store lot--the guy just didn't here it---but people were coming out of the store to find out who was making all that racket).
One of the other driving techniques I learned was to leave enough space between you and the car in front of you at stop lights - just in case the car in front of you dies.
I back in to every space that I can. If I can't back into a space, I find a space where that when I do leave, I can drive straight forward.
I know, people roll their eyes or shake their heads when they see me do this, but I believe it is much, much safer.
Scary stuff. I remember when my kids were in those infant seats that pop onto a base in the car I was terrified I would put the baby down behind the car and forget. So I never ever let that car seat touch the ground. Whenever I see someone put one down behind a car (mostly at the grocery store) I cringe.
I still hold hands with my kids in parking lots and they are 8 and 11. I figure I will keep on doing it forever, at some point it will be for my saftey instead of theirs.![]()

I always try to back into or drive through a parking spot. We usually say kids are bad, but sometimes adults are just as bad. They are looking at a list, rummaging through their purse, chasing their child etc. I know a friend who just backed over their new puppy. 

It would never occur to me that the person was backing up. If I hear a horn in a parking lot, I autmoatically assume it is one of a few things:
-somebody has lost their car and is using their remote to find it or they accidentally hit the panic button.
-they are honking to express their irritation at somebody
-They are some obnoxious teenager hailing their friends.
At no point it time would it have ever occurred to me that the person was backing out and I must therefore get out of their way. As I cannot recall ever hearing a car honk before backing up, my guess is that most people would have no idea what it would mean and would probably ignore it, or stop where they are to figure out who is honking
