I read the report before my last post. I guess you and I just disagree as to what it says.
From that study;
"Based only on the study results presented herein and without referencing other studies,
the study did not show a definitive safety benefit associated with camera installation with regard
to all crash types, all crash severities, and all crash jurisdictions. The study did show a net safety
benefit for some jurisdictions (such as Vienna or Alexandria) but not for others (such as
Arlington). There is evidence to suggest that this difference might have more to do with
variation among intersections than among jurisdictions. Finally, it may be said that the cameras
were associated with a clear decrease in red light running crashes and a clear increase in rear-end
crashes."
As I said trading one problem for another.