The new incoming Sheriff of Pinal county, Sheriff Paul Babeu, is taking the photo radar down from his jurisdiction (hop this link works)
He has several reasons he feels that camera are a bad idea and primarily a money generating venture. I agree that we need to use LE wisely and prudently by using the best and latest technologies available. I'm not sure that cameras on the interstate really does that.
Locally DPS has been touting the lower accident rate since the cameras were put into use. Maybe so, but at the same time the total number of drivers decreased more than the decrease in accident rates. They probably both played a part. How much I don't think anyone can accurately measure.
Red light cameras, which in some intersection also will ticket you for speeding, are a great ideas and use of technology. There are certainly other areas that speed cameras are valuable. I just don't think that is true for the freeway system. Remember it was a traffic stop by LE that nabbed Timothy McVeigh, not a camera.