personally I think that's dumb... the whole point of having a "tree" at all is so you can see that the green is coming at a certain expected time. Otherwise, why not just have a green light that comes on at random, with no yellows? It makes no sense for drag, where you want to see how fast a car can get to the 1/4 mile line, not test someone's reaction time (though I know at certain levels of the sport, that is part of the competition)