The US Interstate Highway System: 40 Year Reporthttp://www.publicpurpose.com/freeway1.htm
Minnesota 80 2,500 0.63 Mississippi 105 3,500 1.46 Missouri 190 6,400 1.33 Montana 50 1,700 2.27 Nebraska 30 1,100 0.72 Nevada 80 1,600 2.13 New Hampshire 20 500 0.58 New Jersey 9
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