Depends on the jurisdiction, but typically, two vehicles backing up is a 50/50.
It would be the person driving fault because it is like the same thing as driving and hitting someone.
The person backing out. If you were in the lane/road behind them they needed to use caution when backing out.
Whoever the police report charges with the accident.
Well if you were backing in and hit someone then it is your fault. But if they hit you, then it is their fault.
The person driving through. If you're backing out then you do not have the right of way.
The person driving in a forward direction has the right of way. If you are backing up, you must wait until traffic is clear before moving. Similar to a rear-ender, when the person hitting someone in front of them is always at fault.
stand up for them
If they backed into you, it's their fault. Failure to yield.
You are simply because you have more responsibility when backing up to make sure it it clear.I found this out when backing out of driveway(mine) and someone turning in hit me.The insurance paid (we both had the same company) but cancelled my insurance.Alfa
Same thing happened to me in CA & we were found to both be at fault....
anytime someone is backing out of a driveway or parking spot, they are at fault. The other driver will only be sited for speeding.