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Whatís the most insane roadway concurrency in the country?

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US 89:

--- Quote from: Jim on June 17, 2022, 03:59:11 PM ---TM does not include a GA 422, as it is apparently unsigned, so it shows 7, not 8, on that Athens stretch.

--- End quote ---

Just because itís unsigned doesnít mean it doesnít existÖ

Itís a completely pointless route though. Most of the 4xx routes in Georgia exist to give interstates an internal state route designation which they would not otherwise have. 422 is entirely an unsigned internal designation for SR 10 Loop, which obviously already has a state route number. I think the advantage of a 4xx route is that their mileages donít have to reset at county lines, which is obviously a plus for a short beltway that spans two counties.

SkyPesos:

--- Quote from: hbelkins on June 17, 2022, 07:56:05 PM ---Depending on your definition of "insane," I think the I-41/US 41 and I-74/US 74 concurrencies are not quite normal.

Also I-73 and I-74 since both are so far off the grid.

--- End quote ---
If weíre using another definition of ďinsaneĒ, US 60/70 pre-interstates could qualify too.

ran4sh:

--- Quote from: US 89 on June 18, 2022, 01:00:16 AM ---
--- Quote from: Jim on June 17, 2022, 03:59:11 PM ---TM does not include a GA 422, as it is apparently unsigned, so it shows 7, not 8, on that Athens stretch.

--- End quote ---

Just because itís unsigned doesnít mean it doesnít existÖ

Itís a completely pointless route though. Most of the 4xx routes in Georgia exist to give interstates an internal state route designation which they would not otherwise have. 422 is entirely an unsigned internal designation for SR 10 Loop, which obviously already has a state route number. I think the advantage of a 4xx route is that their mileages donít have to reset at county lines, which is obviously a plus for a short beltway that spans two counties.

--- End quote ---

SR 10 Loop never had resetting mileage even before the SR 422 designation. However its mileposting has changed several times, originally the 0 was at the at-grade intersection with Old Hull Road in the northeast corner, increasing counterclockwise from there until 10 Loop's interchange with itself (there were no exit numbers at this time), the mileposts were changed in 1999 when exit numbers were first added, and again in 2004 when they were revised to increase counterclockwise instead of clockwise.

zachary_amaryllis:
Warrenton, VA has (or had, I think it's been re-jiggered) a bunch running with US-17 at one time. It was like 15,17,29 and I think something else.

Mapmikey:

--- Quote from: zachary_amaryllis on June 18, 2022, 10:33:21 AM ---Warrenton, VA has (or had, I think it's been re-jiggered) a bunch running with US-17 at one time. It was like 15,17,29 and I think something else.

--- End quote ---

Until the freeway bypass east of Warrenton was opened around 1987, there was a segment of the original western bypass with a 4-route concurrency:  US 15, US 17, US 29 and US 211.

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