I just returned from Arizona for the New Year's. We were traveling south on Alma School Road at Guadalupe and we(my friend was the driver) got our picture taken at a green light. I have heard that Arizona has the red light cameras that also give out speeding tickets. However, this intersection was not listed. Anyhow here are my questions:
1. What do red light cameras use to determine your presense? There is one close to my house and it does not alert me to any radar.
2. Do these combination intersections in Arizona use radar for speed?