And They Do this By way of an app called Trapster 3.0! This app already existed but now it’s been updated with a few new perks, hit the jump if you’d like to know what.
Tat WZA

Using Crowdsource Aide(meaning it uses the info people give it) Trapster uses color codes to let you know things like where the speed trap is, and more importantly, that YOU are speeding, and you should probably slow down!! It also has a cleaner UI(user interface) and terrain maps, AND lets you ‘Vote’ on speed traps(I assume whether they are affective or not). All in all, a pretty useful App, hit the link to download!
Trapster