We just returned from this area as we were traveling across the Southwest. Sierra Vista (and other towns in Arizona) has red light and speed cameras posted all over town, particularly on the main road that you must travel. There are not always signs posted warning of this (which are supposed to be posted). We were going around a vehicle when we saw a large flash. Two weeks after we got home we received a ticket in the mail. The shocking thing was the amount of the ticket: $269. And we were only going two miles over the limit they allow (because we had just gone around a vehicle). They also report this to your state, so it goes against your driving record unless you take the on-line driving course (at a cost of $220). So please be very aware of your speed and of all red lights in Arizona.