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List of Interstate Highways - Wikipedia, the free encyclopedia |
 | | Primary interstates are the major interstate highways of the United States and are assigned a one or two-digit route number. |
| | If the first digit is odd, the interstate is typically a spur route while if the first digit is even, the interstate is typically a loop route. |
| | Alaska's "Interstates" are unsigned, though they all have state highway numbers (which don't match the Interstate numbers). |
| en.wikipedia.org /wiki/List_of_Interstates (979 words) |
