I use my TT920 for it. I can make it alert at a programmed distance and add more speedtrap POI's.
If you have fixed speed cameras, I'd have them.
But for a cop on the side of the road? Probably not. Yes, the police tend to have their honey holes where they set up on a regular basis, but being alerted to every single last one along a stretch of road would get tiresome.
If you decide to travel through AZ, then yes.
100 enforcement cameras on the way for all the highways.
60 of which will be fixed, no radar or laser.