![]() ![]() ![]() ![]() Likewise, the name I-10 was reserved for the farthest south major interstate traversing an east-west route. Thus, for example, the name I-95 was reserved for the farthest east major national cross-country interstate that traverses a north-south route. The most important cross-country interstates get numbers divisible by five, meaning they end in zero or five.The lowest numbers begin in the south and west, and get higher as you progressively move north and east.East-west roads get even numbers, while north-south roads get odd.There are three factors that go into determining the number for a two-digit interstate: The rest of the system flows from this most basic starting point. One and two-digit interstates span multiple regions, while three-digit interstates are more local. The number of digits tells you whether an interstate connects multiple metro areas, or exists solely within a single metro area. Why is I-95 named I-95? What about I-395, or I-270, or I-66? There’s a logical system behind it all, and it’s easy to learn. ![]()
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