I think it's pretty well established at this point that at least some of the cities that have installed red light cameras have also shortened yellow lights, lea

I think it's pretty well established at this point that at least some of the cities that have installed red light cameras have also shortened yellow lights, leading to exactly the behavior described by the GP and the increase in rear-end collisions. Citations: https://www.chicagotribune.com/investigations/ct-yellow-light-timing-met-20141223-story.html https://www.chicagotribune.com/investigations/ct-yellow-ligh... I have no reason to consider the Tribune a biased source. https://nypost.com/2012/10/08/citys-gotcha-traffic-cameras-use-short-yellow-lights-to-increase-ticket-revenue-study/ https://nypost.com/2012/10/08/citys-gotcha-traffic-cameras-u... AFAIK, the NY Post doesn't exactly have the reputation of the Times, but I don't have any reason to consider it biased in this matter either. https://www.motorists.org/blog/6-cities-that-were-caught-shortening-yellow-light-times-for-profit/ https://www.motorists.org/blog/6-cities-that-were-caught-sho... I would tend to assume that "The National Motorists Association" has some pro-car and anti-enforcement bias. Nonetheless, the links are to a third-party site that links directly to local news sources. Feel free to evaluate them as you see fit. I find it hard to imagine that there's a traffic-engineering reason to shorten yellow lights at intersections with red light cameras, and find the GP's claim that [in many cases] they're an instance of policing for revenue to be credible.