I had a project where laps were measured on 1/4 mile track. They had an old mechanical clock doing it. Lot's of arguments about who had the better times. That argument was settled by a 10 MHZ clock and latching decade counter (inside a dos PC, QB45 was used). Laps were reported to the milisec. But stored to the microsec. There was one instance where two fast cars reported the same timed lap. Normally the first car recorded time counted as first. But that time the second car was just a bit faster. A challenge was made, "We showed how the second car was a couple of 10 thousandnths faster)." Settled the argument. The take away both agreed, overkill to measure beyond milisecs. But we did. After that nobody in pit row made another challenge to stated times. Even the NASCAR guys were impressive when they came by during there 1/4 track road show. "They needed timed laps".
