Just did this. Had an hour drive home, so pulled it out and pumped it according to the beat of the songs on the stereo, one pump every snare hit. I listen to alot of varied hard rock and heavy metal, so the rhythm changed alot. One of my favorite songs switched it up from offbeats, to straight time, to double-time to offbeats all over the place in the 6 minute song. Played it a second time. Still made sure I didn't cum until after a few more hours of edging at home. The finish was insane!
I have done this as a passenger in a car me and my mate were out and about chatting about girls and sex as usual both of our cocks were bulging in our trousers my mate looked at my bulge and commented how hard my cock looked, I replied it was and very uncomfortable and then looking at his said you are not much better, we were driving on a very quiet road and he said pop him out and have a wank while it's quiet, now we had often masturbated in group wanks and just us two, so I popped my cock out and stroked away for a while then he pulled into a deserted car park and slipped his out so we could wank together he then suggested we got out of the car to finish off, I was ok man let's go, he came around to my side as it was away from the road, he walked around the car his hard cock bobbing about, as he got around to my side he pulled his trousers and underwear down so he was completely exposed I got out and did the same, we stroked our cocks furiously till we splattered the ground with our cum in one big spot on the ground. We got back in the car and went on still chatting about the same stuff and still hard as hell
I have. Years ago I was driving down I -95 and was feeling horny so I pulled my shoe off and grabbed one of my socks and slipped my cock into it and went to town stroking myself. I shot a big load right into it.