Sure, 3 seconds may be enough for a marshal to raise a flag. But that marshal would need to be placed between the down rider and Troy. So to follow your argument, they should have marshals stationed every 2-3 seconds down the track. That works out to maybe 100 marshal stations for this track. Realistically, when riders are only 2-3 seconds apart, as they are during training, it is not practical to expect a marshal to be able to stop riders at absolutely any position on track within 2 seconds. The road crossing, however, is a different matter. They absolutely...