Well, my ex-husband (kids father) at one time was an over the road trucker, and I only saw him once or twice use a pee jug when I went with him. And he wouldn't STOP the truck to use it. Simply peed while driving. Most of the time, he would wait until we found a rest area or a truck stop, or he'd pull off the side of the road, pretend he was checking his tires and pee between the tires. Those times he did pee in a jug, he threw them in the trash barrel between the diesel fuel pumps at the truck stops. So it could be or couldn't be all truckers doing this. I'd say the majority would have been families with kids.