I went away I guess and opened up some lanes

from Eminem (Ft. Kobe) – Talkin' 2 Myself Lyrics on Rap Genius

Meaning

His 5 year hiatus helped him make key choices

It MIGHT mean that during his time away, it opened up lanes for other rappers such as Lil Wayne and Kanye who prolly wouldn’t be as successful if they had Em as competition from 2004-2009

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