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Difino
| • | Primary interstates are the major interstate highways of the United States and are assigned a one or two-digit route number. Even route numbers are assigned to east/west routes, with the lower numbered routes being further south (I-10) and higher numbered routes in the north (I-90). Similarly, odd route numbers are assigned to north/south routes, with the lower numbered routes being further west (I-5) and the higher numbered routes being further east (I-95).
Three-digit Interstates are spur or loop interstates that usually service large cities and suburbs. The last two digits of a three-digit interstate are always the number of the parent route, the primary interstate where it originated. 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. Three-digit interstates are covered in their parent route's article, and those that have their own articles are linked below. (In the table below, interstates designated with an asterisk are "secret" interstates -- that is, they are not signposted as interstates.)
·Notable exceptions to these numbering standards are Interstate 238 in California and Interstate 99 in Pennsylvania.
Source: [wikipedia: list of interstate highways]
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