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When you look under the car, it's the part that rail that sticks down, normally. They're flat. However, these pictures are indintations of that rail. I believe it's called the subframe, however, I could be wrong.
+1, that sucks! Yeah i'm always paranoid when i go to a new place and they try to figure out the angle or position from where to jack up the car at. There are a lot of idiots out there so next time keep an eye on them.