I haven't expressly seen the 300-meter pit lane length or the 100-meter pit exit length as a specific recommendation. That said, it does state 7 meters per car for the pit lane, and it makes sense to have some margin for pit-out.
Each lane of the pit lane should be 6 meters wide, and there should be at least 4 meters between pit lane and the track.
It's recommended that start/finish be at least 250 meters before the first corner.
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