I prefer the doors with the light beam sensor about 6 inches off the floor.. they won't close no matter what if something is blocking the beam.. provided they're working properly.
But the real moral of the story outta be don't ever work or stand beneath a door.
Years ago I had a garage with one of those big heavy 70's all wood doors. While it was opening one day one of the springs broke, and the weight was too much for the garage door opener.
It tore the Genie garage door opener off the ceiling and slammed down hard enough to xrack the cement.
Remember, for every situation you say "that can't happen" or "thats not likely to happen" there is probably at least one dead guy who thought the same thing.
