This is one of my pet peeves. I was taught to flash all trucks because they are bigger than me. But with the caliber of some of the drivers on the road it's scary as hell out there. I have a nephew that drives OTR, and he pointed it out to me, a lot of these drivers out there can hardly read English. If you don't believe me, set in a truck stop like the I 80 and watch, and listen to them.
The days of the knights of the road are sadly coming to an end. I don't mean to disparge the lady drivers either.
Just my humble opinion
Siberian