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Interstate
Highways
All major interstate highways use one or two digit numbers.
Roads that go north and south have odd numbers. The numbers
start on the west coast and get larger as one goes to
the east coast. (Example: Interstate 5 runs from California
to Washington. Interstate 75 goes through Michigan to
Florida). Roads that go east and west have even numbers.
The numbers start in the south and get larger as one goes
north. (Example: Highway 10 goes from California to Florida.
Interstate 90 goes from Washington to Massachusetts.
Interstate
routes that branch off major, long distance routes are
given three digit numbers. The last two numbers are
from the interstate from which it split.
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US
Highways
US Highways use black and white road signs shaped like
a badge and are assigned one, two, and three digit numbers.
US Highways use the same pattern for numbering as Interstate
Highways. |
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State
and County Roads
Individual states and counties use different types of
methods for state and county roads. Most of the time,
states and counties follow the same pattern as Interstate
and US Highways. |
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