Virtually all athletics tracks are 400 metres long. This is why
they have a staggered start in 400m races. An 800 metres race is
therefore 2 laps of a 400m track.
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More answers
The diameter of the inside lane of an athletics track is 400
meters. Of course, lanes further out have a greater diameter. This
is why the start of 200 and 400 meter races is staggered.