Re: Even numbered 3 di's that go through a city but the parent doesn't

Paul D. DeRocco wrote:
"AGW" <a.whitter.newsgroupsTHECHOP@xxxxxxx> wrote
-- 280 and 680 go through San Jose, CA; 80 does not.
-- 275 through both Tampa and St. Pete; (current) 75 does not. (Yeah, I remember when 75 ended in Tampa.)
-- 279 goes through Pittsburgh, 79 does not.

Any other examples?

Note I said even numbered. Thus 565 (Huntsville, AL) doesn't count.

A long time ago, I recall reading a description of the logic of 3di numbering that explained that even ones are supposed to bypass something while odd ones are supposed to go to something. In practice, it's more like even ones are loops, whether used to go around something (I-805 around San Diego) or to something (I-215 to Riverside and San Bernardino), while odd ones are spurs.

We have a terminology problem here. To some of us that went to old fashioned schools "805" is an odd number, and "110" is an even number.

My understand of the "rules" (violated in several cases) is this:

For the base number (one or two digits) even numbers (8, 10, 80, 94) imply east-west travel (mileage and exit numbers at zero on the west end) while magnitude describes placement (8 in the south, larger numbers to the north, like 94). Odd numbers (5, 15, 95) imply north-south (mileage and exit numbers starting at the southern end) travel with the numbers increasing from west to east.

For the 3-digits numbers, the lower two digits come from the "base" highway and have no other meaning. The hundreds digit, if odd, implies a spur that leaves the base highway and never returns to it. The hundreds digit implies a loop that will return to the base highway, but in actual practice seems to mean "will return to some Interstate. (For example, in California, I have no idea what I480 (the Embarcadero Freeway (before they needed the number for something else) would have connected to -- I 280? I 280 forms a loop with I 680 (and ex? 880) and I am not sure it connects with I 80 at all, unless the label is applied to the old bridge approaches.
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