I have had a few cases of trying to wave down people who are in their own world and oblivious. Few months ago a pop up camper running on the rim. I was not the first person, and they just keep driving. In traffic it is sometimes difficult to catch up.

Guy had a flat in town, pulled along side an waved every geature. He looked at me glared and when the light turned green he drove off.

People wave at me in the gmc all the time. Always in a panic, i check around. Make sure the coach is not on fire and all 6 wheels are still attached. Wave back as they are just complimenting the coach.

This would be a tough trend to get people to follow. I am happy they use turn signals and stop at red light(many do not in my town). Never go on green without looking.