Some auxiliary Interstate Highways are not signed, typically because the routes are already known by another name, and marking them could confuse motorists. A small fraction of three-digit Interstates, especially very short ones (in terms of physical length), are not signed.
| Interstate | Vicinity | Description |
|---|---|---|
| I-305 | Sacramento, CA | Signed as US 50 and Business Loop I-80. It was part of I-80 until October 1983. |
| I-910 | New Orleans, LA | Signed as Business Route US 90. |
| I-315 | Great Falls, MT | Signed as Business Loop I-15. |
| I-124 | Chattanooga, TN | Signed as US 27. |
| I-444 | Tulsa, OK | Signed as US 75. |
| I-345 | Dallas, TX | Signed US 75 (northbound) I-45 (southbound). |
| I-478 | New York City, NY | Signed as the Brooklyn-Battery Tunnel. |
| I-878 | New York City, NY | Signed as SR 878. |
| I-480 N | Cleveland, OH | Signed as a connection between I-480 and I-271/US 422. |
| I-194 | Bismarck, ND | Signed as SH 810. |
| I-495 | Falmouth, ME | Signed as a connection between I-95 and I-295. It was redesignated from part of I-95 on January 5, 2004 Also known as the Falmouth Spur of the Maine Turnpike, with mile markers starting with the prefix FS-. |
| I-595 | Annapolis, MD | Signed as US 50 from the Washington, D.C., area east to Annapolis, Maryland. |
| I-296 | Grand Rapids, MI | Signed as US 131. |
Famous quotes containing the words list, unsigned, interstate and/or highways:
“Modern tourist guides have helped raised tourist expectations. And they have provided the natives—from Kaiser Wilhelm down to the villagers of Chichacestenango—with a detailed and itemized list of what is expected of them and when. These are the up-to- date scripts for actors on the tourists’ stage.”
—Daniel J. Boorstin (b. 1914)
“There yet remains but one concluding tale,
And then this chronicle of mine is ended—
Fulfilled, the duty God ordained to me,
A sinner. Not without purpose did the Lord
Put me to witness much for many years
And educate me in the love of books.
One day some indefatigable monk
Will find my conscientious, unsigned work;
Like me, he will light up his ikon-lamp
And, shaking from the scroll the age-old dust,
He will transcribe these tales in all their truth.”
—Alexander Pushkin (1799–1837)
“At bottom, I mean profoundly at bottom, the FBI has nothing to do with Communism, it has nothing to do with catching criminals, it has nothing to do with the Mafia, the syndicate, it has nothing to do with trust-busting, it has nothing to do with interstate commerce, it has nothing to do with anything but serving as a church for the mediocre. A high church for the true mediocre.”
—Norman Mailer (b. 1923)
“That is the land of lost content
I see it shining plain,
The happy highways where I went
And cannot come again.”
—A.E. (Alfred Edward)