If city planners want to reduce traffic accidents at intersections, the best practice is to make the yellow last longer and insert a pause between the red signal on one side and the green on the other. However, if the objective is to make as much money as possible from red-light cameras, the best thing to do is shorten the yellow signal, eliminate the pause, and enrich the city coffers (even as you kill its citizens).
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.