Interstate/US Route/State Route concurrencies

[Scott5114]

I-44/US-62/SH-37 in Cleveland County, OK (and a little bit of McClain County)

[bob7374]

MA 1A officially is routed northbound via I-90 East to East Boston. There are To 1A trailblazers on the ramp from I-93.

Yes, there are TO 1A trailblazers and even a supplemental BGS directing airport/E. Boston-bound traffic along northbound I-93/US 1 traffic to use I-90 East (Exit 20); however saying that such is the official 1A from its northbound parent is open for debate; especially since MA 1A northbound does exist via the Callahan Tunnel. 

A northbounder could theoretically exit off I-93 further north at Exit 23 and follow surface streets (North to Congress to New Chardon) to MA 1A North & the Callahan Tunnel.  The only logical reason for anyone to do such (outside of a roadgeek seeking a clinch) would be if the Ted Williams Tunnel was closed for repairs, accident and/or police activity.

As you know, this oddity w/1A was the result of the Big Dig project not building/providing direct access to all the harbor tunnels from both directions of I-93, and US 1 being rerouted from Storrow Drive onto I-93 just prior to any Big Dig-related construction.  To be sure, there are issues with these partial interchanges but I can assure you that any related-complaints are because of partial-access to/from the tunnels themselves and not because of a route number discontinuity/interuption.

Got the time to check the official Mass Route Log. It states that North 1A uses the ramp from I-93 N to I-90 East then I-90 to East Boston. Have no problem with MassDOT continuing to sign 1A North through the Callahan since it's been that way for a long time and as you say most drivers aren't going to make a complaint about the signed route number interruption. This wouldn't have been an issue if MassDOT didn't insist that the alternate routes continue along their parents in a hidden concurrency.

[PHLBOS]

Got the time to check the official Mass Route Log. It states that North 1A uses the ramp from I-93 N to I-90 East then I-90 to East Boston. Have no problem with MassDOT continuing to sign 1A North through the Callahan since it's been that way for a long time and as you say most drivers aren't going to make a complaint about the signed route number interruption. This wouldn't have been an issue if MassDOT didn't insist that the alternate routes continue along their parents in a hidden concurrency.

I guess this is one case where the real world & roadmaps (including ones MassDOT's own) don't agree with the route logs.  To my knowledge, the Ted Williams Tunnel was never planned to be a part of 1A.  Yes, the pull-through BGS' at the airport exit (#26) read 1A NORTH rather than 90 EAST; but I believe such was due to I-90 ending at 1A not shortly after the airport exit.

OTOH, 1A southbound is clearly signed up to the Sumner Tunnel.

As MassDOT's insistence on hidden concurrencies for A/Alternate routes w/their parent routes; don't other states do similar?

[SGwithADD]

I-86/US 219/NY 17 near Salamanca.  I believe it's the only such example in NY.

[cjk374]

Louisiana has one and only one:
I-49, US 167, & LA 28


iPhone

Bassoon: I have looked, studied & stared at Google maps & a paper map. I even drove to Alexandria about a month ago. But for the life of me, I don't see where the 49/167/28 Concurrency takes place.

167 & 28 are together on the Pineville Expressway as you approach I-49. I saw the signs for 167 pointing to I-49 south, but LA 28 pointing to north I-49 (and why the hell DOTD didn't bother putting LA 28 on the BGSs bugs me & pisses me off, but oh well  ) Am I mistaken?

[bassoon1986]

Louisiana has one and only one:
I-49, US 167, & LA 28


iPhone

Bassoon: I have looked, studied & stared at Google maps & a paper map. I even drove to Alexandria about a month ago. But for the life of me, I don't see where the 49/167/28 Concurrency takes place.

167 & 28 are together on the Pineville Expressway as you approach I-49. I saw the signs for 167 pointing to I-49 south, but LA 28 pointing to north I-49 (and why the hell DOTD didn't bother putting LA 28 on the BGSs bugs me & pisses me off, but oh well  ) Am I mistaken?

Oh shoot, you're right. I think for some reason I was thinking of just a BGS with all 3. In Pineville where 28 meets the expressway it shows "TO I-49, US 167 South, LA 28 West".

LA 28 is included where the Pineville Expressway merges to I-49. It shows 49 north and 28 west with Shreveport. As well as on the BGS for Exit 86 going northbound on I-49 from downtown. It shows US 71, US 165 and LA 28. Everywhere else 28 is a supplemental shield on the freeways.

So Louisiana doesn't have any examples of Interstate/US Route/Louisiana Shield. Unless you count hidden I-910, US 90 Business, and LA 23 which is only on the service roads on the Westbank of New Orleans.


iPhone

[US 89]

Several in Tulsa OK:
I-444 (unsigned)/US 64-75/OK-51
I-244/US-64/OK-51
I-44/US-412/OK-66

And a few more in OKC:
I-44/US-62/OK-3
I-240/US-62/OK-3
I-40/US-270/OK-3

[US71]

Not posted, but

Arkansas:

I-49/US 71/US 62/AR 16

Also I-49/US62/ US 71/AR 12 (on a technicality)

[mrsman]

Cap City Freeway Sacramento, CA US-50 is cosigned with I-305 and CA-99

Except that I-305 is not signed (but should).

Wouldn't mind seeing it signed.  But it also used to be I-80, I think, before it was rerouted on the northerly bypass of Sac'to (proposed I-880 at the time).

IIRC, when I-80 was singed along the WX, US 50 ended at the Oak Park Interchange.  The WX was never signed as both I-80 and US 50.  US 50 was extended along the WX to West Sacramento when I-80 was rerouted on the bypass and Biz-80 came to be signed on the WX.

[SD Mapman]

I-90/US-14/SD-79 west of Rapid City.

Also the 90/14/34 between Sturgis and Whitewood counts!

[mwb1848]

I-10/US 90/SH 130.

https://goo.gl/maps/Ux31pYto5Js

To encourage trucks to use the tolled Austin/San Antonio Bypass, TxDOT extended the SH 130 a few years ago, meaning you can now follow the SH 130/Toll 130 designation from I-35 south of San Antonio to I-35 near Georgetown.

It also gave us a triple concurrency.