Regional Boards > Pacific Southwest

California's original numbering plan

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Quillz:
Okay, so from what I understand, California was basically divided into NorCal and SoCal, and then the original route numbers were assigned two at a time to each part of the state. So, 1 and 2 went to SoCal, the original 3 and 4 went to NorCal, etc.

My question is, if this pattern was maintained consistently, then some of the route numbers don't seem to line up properly. For example, both 26 and 70 would have been assigned to SoCal, yet both are located more in NorCal. (I'm quite sure, though, that the modern CA-70 is from 1964.) CA-57, for example, makes sense in that by following the scheme, it should be in SoCal, which it is, but CA-65, which should also be in SoCal, is another highway that is mostly in NorCal.

So, the highway numbers that seem out of place, are they all post-1964? I made a table and most of the original 99 numbers do seem to line up as they should (at least, the ones that still exist to the present day), while only a few don't seem quite right. There are some other numbers that don't work (97 should be in SoCal), but obviously are excluded because they have been assigned to a more prominent highway network.

Quillz:
And I suppose as a follow-up question, does anyone know where the dividing point was to separate SoCal from NorCal? Some say a geographical definition is everything north of the Tehachapi Mountains, while politically it's usually considered everything north of Monterey, Tulare, Kings and Inyo Counties.

agentsteel53:

--- Quote from: Quillz on November 16, 2010, 01:47:48 PM ---For example, both 26 and 70 would have been assigned to SoCal,
--- End quote ---

original bear 26 is under I-10.  Original 70 was US-70. 


--- Quote ---CA-57, for example, makes sense in that by following the scheme, it should be in SoCal,
--- End quote ---

57 is a fairly new designation.  It would have been in Norcal.  55 is in Socal.


--- Quote ---which it is, but CA-65, which should also be in SoCal, is another highway that is mostly in NorCal.
--- End quote ---

65 is correctly located; your arithmetic is off a bit!


--- Quote ---So, the highway numbers that seem out of place, are they all post-1964?
--- End quote ---

mostly, yes.  At least post-1950 or so.

NE2:
I wrote http://en.wikipedia.org/wiki/History_of_California%27s_state_highway_system and http://en.wikipedia.org/wiki/List_of_state_highways_in_California_(pre-1964)#Sign_routes (yes, some numbers were skipped) some time ago, so it should still be mostly fine. I believe the ACSC/CSAA division was used: http://en.wikipedia.org/wiki/File:ACSC_CSAA.svg

Quillz:
On a similar note, how were north-south highways that ran within the counties that were used as borders for NorCal/SoCal terminated? Did they physically terminate at another highway, or would they just continue to the north or south as another highway number?

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