To the original OP - Remember, some people are undiagnosed sociopaths. Most of them drive SUV's.

One morning, I had a driver beep at me on a road similiar to the one that you describe, only it was a four lane road. Since we were literally the only two people on the road, I was really irritated at his foolishness That is until we got to a red light and started beeping and swearing at the light as well. Hebecause he was mad at how long the light was taking to change.

Crazy is as crazy does.