Parent/sibling or sibling/sibling concurrencies

[fillup420]

In Boone NC, US 221, 321, and 421 all go through town. 321 and 421 run concurrent north out of town. 221 and 321 run concurrent south out of town, and 221 and 421 run concurrent east out of town, with 221 signed North and 421 signed South. Also in Raleigh, US 64 and 264 run together from I-440 to Zebulon. This is interesting because 264 ends at I-440, with 64 continuing on. Any other examples like this?

Also, fun fact: I believe Boone, NC is the only place in the country where 3 sibling routes meet each other. There even used to be an intersection where 221, 321, and 421 all met, but that changed when a new alignment was built for 221

[TXtoNJ]

US 30/130 in Camden/Collingswood NJ is a notable one.

[hotdogPi]

MA 2/2A (signed), 1/1A (once signed and once unsigned), 3/3A (unsigned)

[Eth]

- US 231/431 from Huntsville, AL to Fayetteville, TN
- US 41/441 from High Springs to Lake City, FL
- US 1/301 near the FL/GA border
- US 301/501 near the SC/NC border
- US 1/501 in Sanford, NC
- US 78/278 twice: once in Atlanta and again in Augusta, GA (did it ever also happen in AL before I-22 was built?)

[Big John]

US 41/141 from Green Bay to Abrams.

[Max Rockatansky]

US 41/141 from Green Bay to Abrams.

US 41 has another US 441 from Lake City to High Springs in Florida.

[froggie]

If we expand this to include Interstate routes, there are a couple:

- I-94/694 northwest of Minneapolis, MN
- I-95/495 on the east side of the (DC) Capitol Beltway

Some others:

- Another US 1/US 301 in central Virginia (basically from Petersburg to Richmond)
- US 1/US 401 north of Raleigh, NC (surprised Eth didn't catch this one)
- US 58/US 258 near Franklin, VA
- US 158/US 258 near Murfreesboro, NC
- US 69/US 169 in suburban Kansas City, KS (along with I-35 for part of it)
- US 10/MN 210 in central Minnesota (210 was numbered deliberately as a child of US 10, and east of the concurrency was a U.S. route until 1973)

- US 78/278 twice: once in Atlanta and again in Augusta, GA (did it ever also happen in AL before I-22 was built?)

Yes, between Guin and Hamilton.  US 43 was also part of that concurrency to complete the triplex.  IIRC, this remained until Corridor X was finished between Exit 16 (south side of Hamilton) and Exit 52 (east of Carbon Hill) sometime in the early 2000s.  I distinctly remember it existing (and Corridor X not completed there) when I was stationed in Meridian, MS from 1998-2001.

[bzakharin]

I-87/I-287 in New York. US 22 / 322 / 422 in PA and Ohio, though only 22 is signed, so it can be analyzed as separate 322s and 422s (though that would mean the former occurs twice in the same state)

[jemacedo9]

I-87/I-287 in New York. US 22 / 322 / 422 in PA and Ohio, though only 22 is signed, so it can be analyzed as separate 322s and 422s (though that would mean the former occurs twice in the same state)

Outside of Lewistown PA, if US 422 were signed on it's implied concurrency, there would be a very short US 22 / US 322 / US 422 / US 522 concurrency. 

[sparker]

Here in N. Calif. we've got the I-80/I-580 reverse concurrency (EB 80/WB 580 and vice-versa) between the Bay Bridge distribution (with I-880) interchange at Emeryville/W. Oakland and Albany, where they diverge.  Approximately 5 miles in length.

[cwf1701]

 in Michigan,  was there a Concurrency of US-12 and US-112 where US-112 was  routed around the Ann Arbor/Ypsilanti area with US-12 on what is now I-94 in the 1950s?

[bassoon1986]

US 71 and US 371 for a mile or two in Coushatta, LA.
US 67 and US 167 through Little Rock and north-central Arkansas
US 60 and US 160 in Springfield, MO
US 18 and US 218 near Charles City, IA

[1995hoo]

A former one: I-440 and I-40 around the south side of Raleigh (I-440 has since been truncated).

[briantroutman]

US 22 / 322 / 422 in PA and Ohio, though only 22 is signed, so it can be analyzed as separate 322s and 422s

You're correct about 422 (there is some evidence suggesting that PennDOT internally considers 422 to be continuous, but it's not signed that way).

But the 22 - 322 overlap is visibly signed for both.

[Ian]

A few that come to mind...

• US 9 and NY 9N through Lake George Village, NY
• US 3 and NH 3A share a wrong-way concurrency in Manchester, NH

[Max Rockatansky]

US 89 and 189 from downtown Jackson south to the split on the Snake and Hobeck River in Wyoming.  Completely weird multiplex that makes zero sense when you think about:

http://www.usends.com/189.html

[Bickendan]

Former: I-40 and 540 near Fort Smith, Arkansas.

[LM117]

US-360/460 in Burkeville, VA

[OracleUsr]

US 21/321 in Cayce, SC

[iBallasticwolf2]

US 27 and US 127 on Central Parkway in Cincinnati.

[roadman65]

US 1/301 in Virginia.
US 301/501 across the NC-SC Line.
US 41/ US 41 ALT in Nashville.
US 9/ NY 9N in Elizabethtown, NY
US 231/431 in AL
US 31/431 in Nashville
US 6/106 now defunct in PA

[Max Rockatansky]

Some other defunct parent/child multiplexes:

-  US 399 met US 99 south of the city of Bakersfield and multiplexed in to the city.
-  US 66 and 666 were concurrent from Sanders, AZ to Gallup, NM.
-  US 60 and US 260 were concurrent for a couple miles near Springerville, AZ.  Oddly US 60 and AZ 260 are now concurrent west of Springerville in the City of Show Low despite the new 260 having nothing to do with the previous US Route.

[jeffandnicole]

NJ tries to encourage this parent and sibling to work together, even though it's truly just the parent route.

https://goo.gl/maps/QR82q3jVmH42

(Technical note - NJDOT doesn't always do this parent/sibling numbering on state routes, although in cases like this its apparent that was the goal here)

[bdmoss88]

US 80/280 - wrong-way in Phenix City, AL

[dfilpus]

Lots of concurrencies of US 1 and its children in NC.

Two separate concurrencies of US 1/501 (with US 15) in Sanford NC and Aberdeen NC.
US 401/501 (with US 15) in Laurinburg NC.
Two separate concurrencies of US 1/401 north of Raleigh and from Norlina NC to I 85, where US 401 ends.
US 301/501 crossing the NC/SC border.