Does anyone do this? I live in a city which was considered rural 20 years ago, and wasn't even part of the Metro Area. Now, It's fully developed and well within the Metro Area, but the cops still have a small town mentality. In other words, we have a lot of speed traps. Most of the roads through town are two lanes with low speed limits and no passing. I get a lot of people who are trying to go through town in order to bypass a backup on one freeway and/or get on another freeway, and for some reason they usually end up tailgating me because they don't like going 30 MPH in a 30MPH zone.
Here's how I like to handle that situation. If I know a speed trap is coming up, and some jackass is riding 3 feet off my bumper, I'll slow down. I'll go 25 MPH or 20 MPH, then I'll pull over to the shoulder and wave them by. They all do the same thing, they gun their engines and flip me off as they drive by, I guess they think they're teaching me a lesson or something. Anyway, the result is that they are going about 50MPH when they hit the radar zone.
As I drive by them right after they've been pulled over, I like to give them a couple of quick honks just to let them know that I was very impressed with their driving skills and that I was deeply hurt by their giving me the finger. Many days I don't even fully recover from the knowledge that someone out there doesn't appreciate my driving skills.