The thing with speeding is that you will end up running more reds and yellows just due to the stopping distance. Not every light has the same yellow period. The grading, speed and design of the road factor in. If you are doing 60 in a 40 zone, there is a very good chance you wont be able to stop in time for the yellow.
This is just 1 of the increased risks speeding brings to our roadways.