The US Interstate Highway System: 40 Year Reporthttp://www.publicpurpose.com/freeway1.htm
Dakota 20 600 0.87 Tennessee 180 5,600 1.30 Texas 670 18,900 1.41 Utah 100 2,800 2.10 Vermont 10 300 0.62 Virginia 200 5,900 1.14 Washington 90 2,400 0.61 West Virginia 50 1,800 0
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