@papayalily I would assume it is local laws. I have never heard of someone actually getting a ticket for doing it. I guess if the cops stake out a quarter mile in front of the speed trap they could vatch people doing it. I guess it would be their word against the cop maybe? You’re probably right that it is hard to prove why the person is flashing their lights, but I think we all know what is really happening.
In the end they should be happy people are slowing down to begin with, but really they want the money from the citations I would think. Although, of course sometimes traps are set up because there have been accidents due to high speeds.
On a 6 lane road near where I lived the speed limit was 50. It was easy to drive faster. Few lights, and the streets was a straight line, very few cross streets, although there was one “hill” where the road went over the Turnpike. One day there was a horrible accident, the driver was estimated to be driving upwards of 80, and ran a red light crashing into a car that had entered the intersection killing 6 people. It was horrible. I remember thinking to myself, I bet the driver is just some guy who is driving too fast. Turned out he was the husband of someone I had worked with. Meanwhile, the outrage in the community caused the speed limit to be lowered. It pissed me off. It is almost impossible to drive much slower on that road, you could fall asleep from boredom, or get home and yell at your spouse out of frustration. What does this guy driving 80 have to do with a 50 MPH speed limit? I would have much preferred they set up some speed traps and get people to obey the law as is.