The cameras (indirectly) block emergency vehicles – because cars stopped at a camera hesitate to get out of the way! Other side effects: Rearenders, $$$ sent to Oz, AZ or Goldman-Sachs, where it won't come back, and tourists and shoppers driven away.
Worse, a false expectation of safety, because cameras can't stop the real late runners, who cause the accidents. (If cameras worked, camera sellers wouldn't have the videos of crashes they pass around.)
Want safety, no side effects?
To cut car/pedestrian accidents, train your kids not to step out just 'cuz the walk sign came on.
To cut nuisance running (a fraction of a second late), lengthen the yellows. It's cheap to do so can be done all over town.
The dangerous real late (multiple seconds) runs won't be stopped by the mere presence of a camera, because the runner won't know (a lost tourist) or won't remember (a distracted or impaired "local") that there's a camera up ahead. They're not doing it on purpose! To cut the real late runs, improve the visual cues that say, "Intersection ahead." Florida's DOT found that better pavement markings (paint!) cut running by up to 74%. Make the signal lights bigger, add backboards, and put the poles on the NEAR side of the corner. Put brighter bulbs in the street lights at intersections. Put up lighted name signs for the cross streets.
Who needs cameras and their side effects?