The US Interstate Highway System: 40 Year Reporthttp://www.publicpurpose.com/freeway1.htm
North Dakota 500 16,000 Dickinson 2.5% Ohio 24,800 752,000 Cleveland + Akron 7.1% Oklahoma 5,600 159,000 Lawton + Norman 5.7% Oregon 3,200 82,000 Medford + Albany 3.4% Pennsylvani
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