Unsigned/Secret Interstates
These routes are officially part of the Eisenhower Interstate System, Yet are official essentially only on paper or internal documentation as no shields or other signage of their existance is posted. Additionally they are federally maintained and adhere to the standards of any other signed Interstate highway.
In many cases an Interstate is unsigned as to not confuse or overburden motorists with an additional number on an already signed route. This occurs in Maryland with the segment of Interstate 595 as it is already known as U.S. 50 and U.S. 301.
| Interstate |
South/West Terminus |
North/East Terminus |
| 305 | CA | West Sacramento | Sacramento
|
|
| 910 | LA | Marrero | New Orleans
|
|
| 315 | MT | Great Falls | downtown Great Falls
|
|
| 124 | TN | Chattanooga | Chattanooga
|
|
| 444 | OK | downtown Tulsa | downtown Tulsa
|
|
| 345 | TX | downtown Dallas | downtown Dallas
|
|
| 478 | NY | Brooklyn, NY | Manhattan, NY
|
|
| 878 | NY | Queens/John F. Kennedy International Airport | Queens
|
|
| 580 | NV | Carson City | Reno
|
|
| 194 | ND | in Mandan | Mandan
|
|
| 495 | ME | Portland | Falmouth
|
|
| 595 | MD | Washington, DC | Annapolis
|
|
| 296 | MI | Grand Rapids | Grand Rapids
|
|
| A-1 | Anchorage | Canadian Border - Yukon Territory
|
|
| A-2 | Tok Junction | Fairbanks
|
|
| A-3 | Soldotna | Anchorage
|
|
| A-4 | Palmer | Fairbanks
|
|
| PR-1 | Ponce | San Juan
|
|
| PR-2 | Ponce | San Juan
|
|
| PR-3 | Ceiba | San Juan
|
* - photos of historical terminus included
Page Updated January 18, 2012.
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