I know where all the cameras on my way to work and where most of them are on the way to other places that I go to regularly. If I'm taking a route that I don't usually take I'll use waze just to know where the cameras are. Ever since I got a camera speeding ticket I started doing this and b"h I haven't received any more since. Those mobile speeding cameras on top of cars i don't worry about, my cheshbon is that for the 1 or 2 times a year that I might get a ticket it's still worth it considering all the time that I end up saving.