Then I turn and cross over the median curb
Hit the 'burbs and all you see is a blur from 8 Mile Road

from Eminem – 8 Mile Lyrics on Rap Genius

He crosses the median that divides 8 Mile from the less cruddy parts of Detroit, a metaphor that he makes the cross into main stream traffic and forgets his past and blurs it all out

A great ending line to an epic song

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