A Large Truck And human Error

                         The sidewalk before being backed over by a truck

The sidewalk after being backed over by the truck. We all make mistakes, but I can't understand this one. The truck that brought the dumpster backed in using the double apron of the driveway and had no problem. The truck that picked up the dumpster either backed in this way or drove out this way. Most likely backed in this way, noticed the mistake and drove out the other way utilizing the apron because there is only one set of tire prints over the sidewalk.