If a races are decided by such small amounts, like lane 1 being a millimeter ahead than lane 2, then the lanes have to be the same down to a millimeter for it to be a fair race. I wonder if timing will outpace feasible construction before long and we’ll have to say, “lane 1 finished a zillionth of a second ahead, but that makes it a tie because we can’t tell if they started a zillionth of a meter closer.”