Longest state lines with no interstate crossings

[skluth]

An interesting question 3 might be, for each state, what is the longest stretch of state line between crossings? i.e. measuring from one Interstate to the next along that state's boundaries.

Michigan:  Start at I-94 going into IN.  Continue to and up the middle of Lake Michigan, into Green Bay (the bay, not the city), along the MI/WI land border, up around Isle Royale, over to the St Marys River, down Lake Huron through to Lake Erie, around the corner along the Ohio border and end where I-75 crosses the line.

Montana along its northern borders is probably even longer.

No interstate crosses international boundaries. By your logic, the longest stretch of a state boundary without interstates would be Alaska which has a border of over 1500 miles with Canada.

[Roadgeekteen]

An interesting question 3 might be, for each state, what is the longest stretch of state line between crossings? i.e. measuring from one Interstate to the next along that state's boundaries.

Michigan:  Start at I-94 going into IN.  Continue to and up the middle of Lake Michigan, into Green Bay (the bay, not the city), along the MI/WI land border, up around Isle Royale, over to the St Marys River, down Lake Huron through to Lake Erie, around the corner along the Ohio border and end where I-75 crosses the line.

Montana along its northern borders is probably even longer.

No interstate crosses international boundaries. By your logic, the longest stretch of a state boundary without interstates would be Alaska which has a border of over 1500 miles with Canada.

If we count nation-states then the Russia-Kazakstan border has no Interstates crossing it. Then again, neither does the US-Canada border so that would win.