I'm usually very loud when I release. Part of what I like about masturbating on long highway drives is that I get a chance to roll down all the windows and get REALLY LOUD at the end! And of course, there's always the thrill of possibly being seen.
I regularly masturbate while driving, it's a fun way to pass the time on a long trip. I also like wakling into a gas station with fresh wet cum stains on my pants.
When I travel by car I will usally wear sweatpant and keep them pulled down so I can rub my dick. My windows have a slight tint, you can see in if your looking. Sometime I do get a horn honk when I pass a truck. When I'm on my motorcycle I like to keep both hands on the bars. The vibration tends to keep me aroused, so I will stop at the big truck stops and go in one of the stalls and rub one off. It's fun knowing all of those people are just outside the door and you can see them through the crack in the door or if they look just right they can see you.
