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.
Previously unsigned Interstate Highways
External links
* [http://www.kurumi.com/roads/3di/index.html Kurumi - 3-digit Interstate Highways]
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