I was travelling with my wife and kids along a secondary highway in North Carolina back in the 1980's. It was close to midnight and everyone was asleep except me. My problem was that I was horny and had been massaging my penis and balls up the leg of my shorts, and had worked myself up to an erection to the point I needed relief.
When I saw the green sign announcing a rest stop ahead I quickly made up my mind I was going to pull in and go inside the men's room and do a quick jerk off to get the relief I sought.
As I pulled in to the parking lot there was only one car and a semi truck and trailer parked in the lot. turned off the ignition, my wife and kids remained asleep. I opened the door and felt the sweltering Carolina summer heat as I made my way up the walkway toward the smallish restroom. As I walked inside I immediately saw there was a sink, next to an occupied urinal, next to an enclosed toilette.
I waited patiently as an older gentleman appeared to be finishing up at the urinal. I was standing behind him against the wall and could see that there was a "glory hole" and I could see a whiff of smoke coming out of the quarter sized hole as the older gentleman at the urinal began to zip up. I then realized I had interrupted a situation between the older gentleman at the urinal and whoever was on the toilette blowing cigarette smoke through the glory hole.