To the Denver area NB Miata owner (green with gold/bronze wheels), flashing your headlights at vehicles during rush hour doesn’t work. I had a truck about 20 feet in front of me, door handle to door handle on the right of me, while flowing in traffic at about 60 mph, in a 65mph zone. Yes, I would’ve enjoyed at least going the speed limit as well, but sometimes, things don’t work out that way. It’s rush hour. Deal with it or find another route home. Somewhat applicable Miata photo for your time.