In addition to that previous post, perhaps some etiquette should be established. If you are the one backing up out of a parking space, and you see that someone is awfully close to driving past you, you wait. You do not have the goddamn right of way. This happened twice yesterday–people just backing up and pretending I don’t exist and almost hitting my car.
As the person backing out the space, you have to wait for the person about to drive behind you/person you’re about to hit to pass, unless they signal to you that they are going to wait for you. So just pull back into your spot if you’re a little too far out of the space or simply stop backing up if you haven’t moved very far.
It’s pretty simple: If you see another car approaching your vehicle as you are backing up, press on the breaks and stop. Wait until that vehicle has passed and then resume your reverse motion.