I would advise against any alcohol at the end of their shift. Just in case they have to move.
I was at a Pilot and there was no reserved sign nor anything painted on the pavement. They woke me up in the middle of my 10 and told me to move because they claimed I was in a reserved spot and all reserved spots are booked. I think they were pulling one on me but the guy had a gun. It was a private security guard.
Imagine if I had a few drinks and hit the road?