Red light cameras do NOT do so, and when the companies/cities screw with the properly engineered yellow light timing to increase revenue, the cameras INCREASE crashes and injuries. It has been definitively studied multiple times, and cities have de-installed camera systems after these findings.
If cameras are installed without adjusting the yellow- light timing, the effect is not demonstrated. Thinking about it, a likely camera ticket will reduce one of three types of red-light-running, where an impatient driver slows at the red light, looks, then crosses anyway if traffic is light. That one causes few accidents — the careful drivers are already careful and either don't do it or do it with sufficient cautions accidents are extremely unlikely.
The others, where the driver fails to see the red light and blows through it, or where they are just on some criminal blast through town (evading cops, high on drugs, whatever), will not be deterred in the slightest by the cameras. The eyesight of the first will not be helped by a likely camera-automated-ticket, and the second already has far bigger legal problems coming and won't care.
So, explain the circumstances where a red light camera actually reduces accidents and injuries. I'm not even seeing a plausible measurable effect beyond revenue extraction.
