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Interstate 12, located entirely within Louisiana, has never had any associated 3di's.
I-112 is an early California proposed number inconsistent with the interstate highway numbering convention.
I-112 (preliminary numbering) California (link)
On April 1, 1958, California submitted to AASHO a numbering plan for its proposed
interstates, including 3-digit spurs numbered in the low 100s and not associated
with their parent interstates. Interstate 112 was the proposed number for what
became I-205. [1]
This number was not compliant with AASHO's numbering convention and was rejected.
On August 7, 1958, California had bought in to the system and
submitted I-205. This was approved, along with the rest of California's original
interstate highway system, on Nov. 10, 1958. [2]
See also:
- California Interstate Route Numbering (Stephen Summers)
- California Interstate Types and History (Daniel Faigin)
Sources
- Summers, Stephen. "Interstate system route numbering." http://www.nwindianahwys.homestead.com/INTER_MAIN.HTML. (29 May 2003)
- Faigin, Daniel. "California Highways (www.cahighways.org): Interstate Highway Types and Interstate History." http://www.cahighways.org/itypes.html (29 May 2003)