I really like to use the android app "Trapster". It uses crowd sourcing to find common speed trap locations and if anyone runs into a live police trap they report it to the server.
This helped me on my long road trip down 81 in my civic. I was able to watch my speed when I saw a danger zone was approaching. I passed several known locations that had a cop sitting there.
I bet this coupled with a radar detector of some sort would be a pretty good defense against traps.
GT/CS Race Red M/T
Delivered 6/21, first day of summer