Just curious . . . does anyone know what the significance of the '600 Yards To Go' sign on Birdcage Walk is? I get the fact that it's telling runners they're almost there and to try and provide the motivation for a sprint finish, but why 600? It's not a quarter of a mile (440 yards), or a half a mile (880 yards) distance and it's not the 0.2 (352 yards) of the 26.2. Could it be it's because it's a convenient spot to put the sign up on Birdcage Walk? Why not 500 yards? Am I being thick? I know its not important but it's been bugging me .