Because we all play the same teams in conference, so it's a there's less variance in the strength of those road games.
Here's several different looks, though.
Non-conference games:
Road:
(2-0) - Iowa
(1-0) - Penn St, Ohio St, Michigan St
(1-1) - Wisconsin, Northwestern, Purdue, Illinois
(0-0) - Maryland, Indiana
(0-1) - Rutgers, Michigan
(0-2) - Nebraska, Minnesota
Neutral:
(3-0) - Maryland, Michigan
(2-0) - Indiana
(2-1) - Nebraska, Ohio St, Iowa
(3-2) - Michigan St
(1-1) - Northwestern, Minnesota, Penn St
(1-2) - Purdue
(0-1) - Rutgers, Illinois
(0-3) - Wisconsin
Overall non-conference, non-home records:
(3-0) - Maryland
(2-0) - Indiana
(4-1) - Iowa
(3-1) - Michigan, Ohio St
(2-1) - Penn St
(4-2) - Michigan St
(2-2) - Northwestern
(2-3) - Nebraska
(1-2) - Illinois
(1-3) - Minnesota, Purdue
(1-4) - Wisconsin
(0-2) - Rutgers
Overall Road records:
(5-3) - Penn St
(4-4) - Michigan St, Illinois
(3-3) - Maryland
(3-5) - Iowa, Ohio St
(3-6) - Wisconsin, Purdue
(2-5) - Michigan
(1-5) - Indiana
(1-6) - Rutgers
(1-7) - Northwestern
(1-8) - Minnesota
(0-9) - Nebraska
Overall non-home records:
(6-3) - Maryland
(6-4) - Penn St
(7-6) - Michigan St
(5-5) - Michigan
(5-6) - Iowa, Ohio St
(4-5) - Illinois
(3-5) - Indiana
(4-8) - Purdue
(3-9) - Wisconsin
(2-8) - Northwestern
(2-9) - Minnesota
(2-10) - Nebraska
(1-7) - Rutgers