OBR - 7.09
It is interference by a batter or a runner when...
(k) In running the last half of the distance from home base to first base while the ball is being fielded to first base, he runs outside (to the right of) the three foot line, or inside (to the left of) the foul line and, in the umpire's judgment, interferes with the fielder taking the throw at first base, or attempting to field a batted ball; The lines marking the three foot lane are a part of that "lane" but the interpretation to be made is that a runner is required to have both feet within the three foot "lane" or on the lines marking the "lane."
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Dan
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