Who is at fault when a person backing out of a parking spot backs into another car going the wrong way in a one-way parking lot?

Both of you are At Fault to a degree. Depending on who primarily had the right of way, which in this case sounds like the person not in his or her parking space their insurance will actually be responsible for any damages that resulted. We are disputing this situation now. The insurance company says it was both parties fault. My question is, If I am traveling the interstate in the wrong direction and hit someone is it partialy their fault because they should have seen me coming? Wrong way mean "WRONG". I went through this exact thing, when a snowplow went up the wrong way in a marked one-way part of the parking lot row and hit my car as I was backing out. I thought for sure he would be held responsible. I wasn't expecting a truck from that direction. In the end, I was found to be at fault for backing out into him.