What is the dumbest thing you have seen while on the road?

I don't have a camera, I have mirrors 2 of them & I do 'take stock' of who is behind me when a passing lane comes up. I keep an eye on them hoping all or as many as possible will make the best of passing lane length to get around me.

I won't do cars any special favours. They have the HP. Trucks & other RVs will get special easement maybe by slowing down especially on a stretch where passing lanes are few.