Cities Busted for illegal Yellow Light Lengths

And ao we find that the governments of certain states and cities have been busted for illeglly shortening the yellow lights in an effort to give out citations via red light cameras. Just so you understand: it is a knnown fact that a relatively long yellow light results in fewer accidents and fewer run red lights. Municipalities that purposefully shorten the lights and directly responsible for creating a hazardous situation for motorists in a clear case of money grubbing. Zthe quesion I have is why haven't these towns been sued?