by One mans opinion on February 16th, 2010

One mans opinion

Question

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Why do so many of the California Interstate Highways have the number "80" in them? for example:
I-80
I-280
I-380
I-580
I-680
I-780
I-880

Is 80 a lucky number for the traffic engineer or was he/she 80 years old when he/she designed the Interstate system? Why not just start at 1 and work upwards? I have driven on all of these highways at one time or another but never realized until now that they all have 80 in the name

Answers. 1 helpful answer below.

  • by Glenn Blaylock on February 20th, 2010

    Glenn Blaylock

    With the interstate highways, the one and two digit numbers are used for the main highways that actually go across the country. The three digit numbers designate local spurs off of the main interstate. I-80 is the major highway that goes from San Francisco to New York City. I-880, etc. are spurs off of I-80 that carry traffic to different parts of various metropolitan areas through which I-80 passes.

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