There has been a lot of reporting about how big companies approach cities and offer to install red-light cameras at intersections at no cost to the city. The company installs and runs the system, and give the city a cut of the take. In exchange, the city hands over control of the light timing to the company.
This sounds like a win-win, the city gets safer intersections and ticket money, without having to do anything. Unfortunately, it's been found that once it gets publicized, red-light infractions go down, and then the company is left with a situation where they can't make any money to recoup their investment. So what do they do? They adjust the light timing in ways that will increase red light infractions (shorten the yellow), which is the opposite of what you want to do for safety purposes.