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The logic behind road numbers

175 bytes added, 18:36, January 23, 2006
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Roads that circumscribe major metropolitan areas have three digits. Thus, 495 circumscribes the Boston area.
 
Further, three-digit interstates with a even first digit are ring roads that run around cities, like 495. Odd first digits (like 395 in CT) signify a spur highway to a city.
Roads that run north/south have odd numbers. Thus, 95 runs from Florida to Canada.
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