Just to let you know, DPS is exploring new technology where your radar detectors won't help you.
For the last couple of years they have been using mobile license plate readers (LPR) mounted to the front of patrol cars in the Casa Grande area. They automatically read the plate and then check the plate against a stolen vehicle database. A single patrol car ran 1.1 million plates in the last year. This project was initiated to catch stolen vehicles from Phoenix headed to Mexico.
How does this relate to photoradar? The europeans have been using LPRs for years for speed enforcement.
DPS is looking at installing them on the backside of bridges over each lane of traffic (so that you don't see them approaching the bridge). One will be placed at a strategic location, say Riggs Rd bridge on I10 just south of Firebird raceway. One or multiple other cameras will be placed at strategic points on your way to Tucson and just before entering Tucson.
The system will search the plate read against previous cameras and then determine your average speed over the total distance.....no radar.....no induction loops. This system becomes more effective for say a trip between Globe and Show Low where they could easily measure your time across the distance and compute your average speed. I know this as my husband works for DPS. There is no real way to defeat it.
In September, DPS lowered the "trigger" speed to 10mph. So you are now only allowed 1 to 9 miles over the posted limit. Its on their website.