Red light cameras are good. Minimal bias (fn) compared to an all-too-human police officer.

And it's not like speed traps, where the posted limits are well below the design speed of the road. A red light is a red light!

fn: We can argue the toss around discriminatory placement of cameras e.g. there's probably more of them in neighbourhoods with certain demographics, but there's a simple solution here: every signalised intersection getting a camera, or at least the top half by traffic volume.