Some context from the drivers point of view would be good, just looks like he made an honest mistake. I can only assume he was coming out of that shipper and trying to make the turn down that little street and just put the wheels off the pavement.
Was it white cane week? Maybe as part of Make A Wish, that week all the blind people got a chance to experience driving a truck.
He didn't slide, he drove it there. Either going forwards or trying to back into the parking lot. Easily avoidable.