Here's a thought though. When you are driving and you forget to dim your lights, you know all about it because oncoming traffic flashes their lights at you. If there's not even a decent minority of people flashing their lights at you, then how reliable is one solitary motorist? Especially since holding up traffic was a listed concern, which kinda indicates it was a motorist yelling out his window, and more likely than not the motorist was not in oncoming traffic.