Why do passing trucks blink their lights?

I've always taken it as a habit or thanks for not speeding up while I'm passing.

 

loose pigtail?

 

Just giving a heads up to the vehicle they are passing. Not everyone uses their mirrors. Lol!

 

In the daytime, sometimes I do it if I think I might have missed their blink because I wasn't looking back when they blinked at me and don't want to seen ungrateful. I would rather say thanks for nothing rather than give no thanks for something. At night, it's a different story.

 

Maybe telling you Thank you for not flashing your highbeams, which generally you should never flash. Maybe you ewere drifting about, hard to say.

 

Maybe they had a epiphany and wanted to share.





Sirscrapntruckalot - Has jokes, not good ones, but has jokes.

 

Or maybe another driver who does not believe in pretrips.

 

I sometimes blinked "thank you" to everyone I passed as or after I returned to their lane, just as a courtesy. No brain cycles wasted keeping track of who "blinked me over", who "blinded me with their brights, and who did nothing once I cleared them.