All interstates in the US that run north/south are odd numbers, i.e. I-95, which runs from Maine to Florida. Even numbers run east/west. And most of the interstates do have exits that coincide with the mileage markers. I-4 has recently changed to this system. The ring roads, or beltways, usually go around a city, and connect up with a highway of a similar number. I95 has beltways that are numbered 195, 295, 395, etc.
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