When I was in the U.S. Army back in the 1970's and 80's, it was common to see women flashing us in the convoy while passing us. Having 2-way radios in most of our vehicles, as soon as the guys in one vehicle was flashed, the rest of the convoy was put on alert with make, model and color of the car to be on the lookout for. Sometimes we were all flashed, sometimes not, but it was always funny listening to the guys on the radio bragging and describing the circumstances behind the flash.
On another note...
One day, while my wife and I were driving down I-90 (Mass Pike) coming back from Boston, MA in my Dodge Ram 3500 (Big, tall truck), my wife gasped and told me to look at the lone guy driving the car we were passing. Even from my side of the truck it was easy to see that the driver had a men's magazine spread open on his console, his pants unzipped and his cock in his fist, just pounding away. He was so engrossed in what he was doing that I'm still not sure if he was even aware that we were there. My wife wasn't that interested in watching, so we continued to pass the guy and pulled away.