Usually allocation decisions are related to actual car/pedestrian fatality/injury counts + trial placements and measurements. Either way, wouldn't you be in favor of measures that remove police from overpoliced poor neighborhoods in favor of a technology focusing on traffic safety enforcement?
The police aren't removed, they're still there, just with more technology, more information, and more power now.
They shorten the yellow light interval to gain more revenue. It's an irresistible corruption when working on a revenue share.