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Date:         Fri, 20 Apr 2007 10:40:17 -0400
Reply-To:     Bill Glenn <idahobill@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Bill Glenn <idahobill@GMAIL.COM>
Subject:      HIghway Numbering System NVC

Fellas, there's a good reason there's no U.S. Highway 1 in California (but there is a U.S. 101): U.S. highway north-south routes have odd numbers, with numbers increasing from east to west. U.S. highway east-west routes have even numbers, with numbers increasing from north to south. U.S. highway east-west routes ending in 0 tend to be cross-country routes. Three-digit U.S. routes contain the two digits of their parents routes, but there is not an odd and even number system.

And while on the subject: Interstate north-south routes have odd numbers, with numbers increasing from west to east. Interstate east-west routes have even numbers, with numbers increasing from south to north. Interstate highway routes have one- or two- digit numbers. North-south interstates ending with a 5 and east-west interstates ending with a 0 are typically major cross-country routes. A three-digit interstate always ends with the two-digit number of the main interstate it loops off from, except I-238. Three-digit road numbers beginning with an even number are either beltways that go around a city or freeways that go through a city. Three-digit road numbers beginning with an odd number branch off the main interstate.

Now back to the regularly scheduled Vanagon programming...


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