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| List of intrastate Interstate Highways ： ウィキペディア英語版 |
List of Interstate Highways
Primary Interstate Highways of the United States are numbered with one- or two-digit designations. Their associated auxiliary highways have three-digit numbers. Generally, odd-numbered routes run north-south, with lower numbers in the west and higher numbers in the east; even-numbered routes run east-west, with lower numbers in the south and higher numbers in the north. Routes divisible by "5" (for example, I-40 or I-75) are major routes, often running coast-to-coast or border-to-border.
Five pairs of numbers are duplicated throughout the system; the corresponding highways are separated by large distances which prevent confusion. Below, these are differentiated from each other by "West" and "East". The main list is followed by sections listing the primary Interstate highways in Alaska, Hawaii, and Puerto Rico.
==Primary Interstate Highways==
There are 67 primary Interstate Highways listed in the table below, and 43 of them have auxiliary routes.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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