Not my shot.. someone elses' on flickr
Apr 21, 2007
Apr 20, 2007
US/Interstate Highway Trivia
Subject: Highway Numbering System NVC
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.
Apr 19, 2007
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