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Interstate 13 does not exist.

I-113 is an early California proposed number inconsistent with the interstate highway numbering convention.

I-113 (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 113 was the proposed number for what became the original alignment of I-680. [1note]

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-680. This was approved, along with the rest of California's original interstate highway system, on Nov. 10, 1958. [2note]

(Earlier in 1957, the state had submitted I-5 for this highway. Today's I-5 was to be called I-11 in that proposal.) [1note]

See also:


  1. Summers, Stephen. "Interstate system route numbering." http://www.nwindianahwys.homestead.com/INTER_MAIN.HTML. (29 May 2003)
  2. Faigin, Daniel. "California Highways (www.cahighways.org): Interstate Highway Types and Interstate History." http://www.cahighways.org/itypes.html (29 May 2003)