STATES WHERE INTERSTATE HIGHWAY EXIT NUMBERS ARE NOT BASED ON MILEAGE
Most states in the United States have interstate highway exit numbers
which are based on mileage (for example, near interstate mileage
marker 95, which would be 95 miles from either the start of the
interstate highway or a state border, there would be "Exit 95"). Of
course, since many parts of interstate highways have fewer than one
exit per mile, so there could easily be an "Exit 93" and an "Exit 95"
but no "Exit 94".
In the states listed below, interstate highway exit numbers are not
based on mileage but are strictly in numerical order, as in "1, 2, 3,
4, etc." So, at mileage marker 95, there could be an "Exit 10" (if
there had been only 9 exits up to that point). Now...the question
becomes what happens if a new exit needs to be created
between...say..."Exit 8" and "Exit 9"? Usually something like "Exit
8A" is created.
3. New Hampshire
4. New York
5. Rhode Island
California used to have no exit numbers for interstate
highways. However, this is changing, and many interstate highways
(and state freeways) now have exit numbers. Also, Maine and
Pennsylvania have transitioned from exit numbers based on pure
numerical order to mileage on the interstate highways.
Alaska has no interstate highways (and the only highway resembling
a freeway, Highway 1, in a couple of locations near Anchorage, has
no exit numbers).
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