If you know the approximate lap times that cars are running, the interval time can give you a pretty good idea of the distance between the cars.
Say during the feature they were running 17 second laps and the interval is 3.24 seconds, the winner was approx 1/5 of a lap ahead when he crossed the line.
1/5 of a lap on a big half mile such as Knoxville is roughly 528 ft.
All it takes is a little math.
If you want to take it a step further and go on Google earth you can measure distances on the track. The front and back straits at Knoxville are roughly 600 ft long.
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