//Our police don't see things that way, NJ! //
I did say the Devil's Advocate had arrived, 'Chico! Just trying to promote a bit of controversy!
As it happens I agree 100% with you. These devices seek to allow (or even encourage) drivers to speed with impunity, safe in the knowledge that they will be adequately warned of a detection device ahead.
When you look at forums that deal with road traffic law you will find countless drivers who have been detected speeding begin their tale with "I didn't see the camera until it was too late" or similar. It doesn't seem to occur to them that speed limits apply elsewhere other than in the vicinity of speed cameras.