I swear that there's one here in Herndon (DC suburbs). No room for any police to sit on the side and clock speeders and its on a 2 lane residential road 35 mph. Maybe Spock or Flori's been by it?

Anyhow, I have to admit that I've been tempted to try and beat it but I'd have to be running somewhere b/w 55 or 60 mph to get through in time which would be pushing it.