Not all
transcontinental interstates will end in 0 or 5 -
interstate 69 is planned from
mexico to
canadia.
Thanks Ed - I completely
forgot 3 digit interstates. But you are
sorta wrong - it is much
simpler. An
odd first digit
should mean it is a
spur - only one end is at another
interstate. An
even first digit means both ends are at other
interstates. This usually happens but
sometimes like in
california there are
too many 3dis and
not enough 2dis. Of course the last 2 digits are the
parent interstate.
kurumi.com has more
info.
But that is a very
interesting theory!
A hundreds digit of 1 is a local spur into a city.
A hundreds digit of 2 is an express through a city.
A hundreds digit of 3 is a bypass between highways.
A hundreds digit of 4 is an express around a city.
A hundreds digit of 5 is a local spur into a city.
A hundreds digit of 6 is a wide bypass around a metropolitan region.
A hundreds digit of 7 is a wide bypass around a metropolitan region.
A hundreds digit of 8 is an express through a metropolitan region.
no offense