The headlight flash is trucker code...if you do it for them they typically flash the trailer lights back...kinda like a salute and I can say they are typically appreciative (BTW...not a high beam flash but an off/on flash).
My father was a long haul truck driver (lower 48 states) for 35 years. 9mos/year on the road, moving furniture, loading his own truck as an owner operator...he was one of the good truckers with over 1 million safe driving miles...I cannot say they are all good drivers but a lot of them are. If they are an owner/operator all expenses are paid out of pocket (fuel, repairs, tires, food, taxes, etc.) so typically an owner operator is going to be more cautious than a driver who doesn't have to pay for damage.
On a side note there are certain trucking companies which hire mostly new drivers (Swift is an example) I typically watch out for those trucks.
Wish I could do an on/off flash. Darn automatic headlights can't turn off while driving. But most drivers know this and a quick brights flash is understood the same way.
My father was a long haul truck driver (lower 48 states) for 35 years. 9mos/year on the road, moving furniture, loading his own truck as an owner operator...he was one of the good truckers with over 1 million safe driving miles...I cannot say they are all good drivers but a lot of them are. If they are an owner/operator all expenses are paid out of pocket (fuel, repairs, tires, food, taxes, etc.) so typically an owner operator is going to be more cautious than a driver who doesn't have to pay for damage.
On a side note there are certain trucking companies which hire mostly new drivers (Swift is an example) I typically watch out for those trucks.