On 2017 Jun 11 16:35:54, you wrote to me:

 JD>>> I believe you meant I-75 rather then I-85 

 ML>> yup... i had started to do all three, 95, 85 and 75 but realized that
 ML>> 85 is just a short one that doesn't go from top to bottom like the
 ML>> others do 

 JD> I'm still trying to figure out why I-4 is an interstate, because it is
 JD> wholy contained within the state of Florida.  Goes East/West

don't be confused by the term "interstate"... it doesn't always mean "existing
or carried on between states"... in this case, it is the term used for "The
Dwight D. Eisenhower National System of Interstate and Defense Highways
(commonly known as the Interstate Highway System, Interstate Freeways, or
simply the Interstate)" which is "a network of controlled-access highways that
forms a part of the National Highway System of the United States."

as for I-4, there are apparently 17 others like it...

  Number  Length (mi)  Formed  Notes
  I-97       17.62      1987   Maryland only
  I-14       25.90      2017   Texas only; planned extension east and west
  I-2        46.80      2013   Texas only
  I-86       62.85      1980   Idaho only
  I-19       63.60      1972   Arizona only
  I-73       82.40      1997   North Carolina only
  I-12       85.59      1967   Louisiana only
  I-88      117.75      1968   New York only
  I-27      124.13      1969   Texas only
  I-4       132.30      1957   Florida only
  I-88      140.60      1987   Illinois only
  I-37      143.00      1959   Texas only
  I-17      145.76      1961   Arizona only
  I-16      166.81      1972   Georgia only
  I-43      191.55      1981   Wisconsin only
  I-96      192.06      1959   Michigan only
  I-45      284.91      1971   Texas only
  I-87      333.49      1957   New York only

)\/(ark

Always Mount a Scratch Monkey
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 * Origin:  (1:3634/12.73)