Shortest duplex?

[hbelkins]

Same thing with US 460 and KY 646 east of Mt. Sterling.

http://maps.google.com/?ie=UTF8&ll=38.021823,-83.91579&spn=0.002396,0.004817&t=h&z=18

[TheStranger]

The shortest signed concurrency in California history - if I'm not mistaken - would be all 374 feet of what was US 40/50 in Sacramento from the early 1940s to about 1957, along 16th Street between Capitol Avenue (which originally was M Street) and N Street:

http://members.cox.net/mkpl2/hist/droz-sjsaca42.jpg

http://maps.google.com/maps?f=d&source=s_d&saddr=16th+%26+N,+Sacramento&daddr=16th+%26+Capitol,+sacramento&hl=en&geocode=&mra=ls&sll=37.0625,-95.677068&sspn=39.371738,68.027344&ie=UTF8&ll=38.574376,-121.486417&spn=0.001189,0.002076&z=19

[agentsteel53]

nice U-turn for US-50 there!

[OracleUsr]

I-85/73 in Greensboro is only technically a duplex.  You see a sign for I-85/73 S/N, then you see the split.

Not sure if that's really a duplex or not, since the I-73 traffic exits on to the C/D roadway and then onto what is now I-73, without ever touching I-85.

[agentsteel53]

I-85/73 in Greensboro is only technically a duplex.  You see a sign for I-85/73 S/N, then you see the split.

Not sure if that's really a duplex or not, since the I-73 traffic exits on to the C/D roadway and then onto what is now I-73, without ever touching I-85.

where is I-73 signed?  I've only seen the non-future variant on the 73/74 multiplex.  (and no state-named 73's anywhere, alas.)

[TheStranger]

nice U-turn for US-50 there!

Yeah, the US 50 bypass that existed in that time period (along the south portion of LRN 98, via 14th Avenue and 65th Street) was actually MUCH more logical of a through route!

http://www.americanroads.us/citymaps/1944CaStateMapSacramento.png

I suspect that 50 was extended west for the same reason that 70 was (to provide a full "transcontinental" scope for an x0 route).  Not sure if many travelers ever used 50 between Sacramento and SF for that corridor, as 40/today's 80 is more direct (86 miles, as opposed to US 50's 131 miles).

[agentsteel53]

I'm surprised they didn't just multiplex 40 and 50, like they did with 60 and 70.

[TheStranger]

I'm surprised they didn't just multiplex 40 and 50, like they did with 60 and 70.

When 48 was decomissioned, 50 was essentially extended onto it (and the old 99W in Manteca).  In other words, it sounds as "logical" of an extension as US 63 in Arkansas.

70 didn't entirely run concurrent with 60...for a few miles between Pomona and Beaumont, along 99 (what later became 10).  But there were a few mid-1930s maps which had 60/70 together through Riverside for the entire route!

[dfilpus]

I-85/73 in Greensboro is only technically a duplex.  You see a sign for I-85/73 S/N, then you see the split.

Not sure if that's really a duplex or not, since the I-73 traffic exits on to the C/D roadway and then onto what is now I-73, without ever touching I-85.

where is I-73 signed?  I've only seen the non-future variant on the 73/74 multiplex.  (and no state-named 73's anywhere, alas.)

I 73 is signed in a multiplex with US 421 on the Painter Boulevard (Greensboro Loop) from I 40 to US 220. It is signed Future on the multiplex with Future I 840 north of I 40 and on US 220 south of I 85 to Asheboro. Bob Malme has a number of pictures on his page at http://www.duke.edu/~rmalme/i73seg4.html#seg5

[iwishiwascanadian]

What about I-84 and US-44 on the Bulkeley Bridge in Hartford?  It's about 1100 feet. 

[yakra]

VA 178 and VA 180, on Virginia's Eastern Shore, is 0.03mi per the VDOT traffic log.  Per VDOT's shapefiles, it measures out to 118.6ft centerline-to-centerline.

The ME119/124 wrong-way`plex in Minot is 0.01 mi -- about 52.8 feet, but I need more sig figs!

I have to learn GIS projections before I get any more precise.

[The Premier]

I-76 and I-80 share pavement at the Ohio Turnpike Exit 216 toll booth.

[yakra]

Wrong-way`plex, no less. Sneaky! Could that be the shortest wrong-way`plex on the I-system?

[froggie]

Possibly the ONLY wrong-way plex on the system.  Certainly the only one I can think of offhand.

[rickmastfan67]

Possibly the ONLY wrong-way plex on the system.  Certainly the only one I can think of offhand.

Forget I-77 and I-81?

[agentsteel53]

Possibly the ONLY wrong-way plex on the system.  Certainly the only one I can think of offhand.

isn't 77/81 backwards?

[Ian]

How about I-80/I-580 in Oakland, CA?

[mightyace]

And, I-26/I-240 in Asheville, NC

[thenetwork]

I-76 and I-80 share pavement at the Ohio Turnpike Exit 216 toll booth.

Which also means that there is a section, albeit a very small section of the Ohio Turnpike that technically does not have a numbered route on it!!!

Here is another Ohio Turnpike technicality:  There are actually FOUR interstates that are within the tolled sections of the Ohio Turnpike -- I-76, I-80, I-90...and I-480!!!  The mileage for I-480 (Mile "0") begins just to the right of the gore sign for Exit 151 (http://www.flickr.com/photos/virtual_freeway_tours/1330332240/in/set-72157601875891592/), and the toll plaza is still just under a mile away.  

Coming from I-480 West, the overhead BGS show I-480 continuing onto the ramp to the Ohio Turnpike, again with I-480's Mile "0" beyond the ticket booth. http://www.flickr.com/photos/virtual_freeway_tours/1329297199/in/set-72157601881946071/

[mightyace]

^^^

What about I-680?  Is it's zero mile marker on the toll or free side of the booths?

[thenetwork]

^^^

What about I-680?  Is it's zero mile marker on the toll or free side of the booths?

I-680's zero-mile marker starts at the (free section of) I-80/SR 11 interchange.  The eastern terminus is at the Turnpike.  It's been years since I have taken I-680 East onto the turnpike (I used to bail  before the toll road and take the back roads to OH-14/PA-51 to get to then-PA-60 to Pittsburgh toll-free) and back then, I don't remember if they had green mileage signs past the toll plaza -- the blue 2/10th mileage signs were still a twinkle in ODOT's eye.  

[Alps]

^^^

What about I-680?  Is it's zero mile marker on the toll or free side of the booths?

I-680's zero-mile marker starts at the (free section of) I-80/SR 11 interchange.  The eastern terminus is at the Turnpike.  It's been years since I have taken I-680 East onto the turnpike (I used to bail  before the toll road and take the back roads to OH-14/PA-51 to get to then-PA-60 to Pittsburgh toll-free) and back then, I don't remember if they had green mileage signs past the toll plaza -- the blue 2/10th mileage signs were still a twinkle in ODOT's eye. 

Pretty sure the roadway past the toll barrier would be long enough to still be considered I-680.  I still consider myself having clinched the route despite taking the last exit because I could at least see the toll plaza.

[WNYroadgeek]

Some shorties from NY:

NY 324\US 62 in Amherst (4/10 mile): http://maps.google.com/maps?f=d&source=s_d&saddr=N+Bailey+Ave&daddr=42.980759,-78.822913&hl=en&geocode=FfTTjwIdDGVN-w%3B&mra=mi&mrsp=1,0&sz=15&sll=42.98145,-78.816562&sspn=0.016671,0.027595&ie=UTF8&z=15

NY 5\NY 36 in Caledonia (4/10 Mile): http://maps.google.com/maps?f=d&source=s_d&saddr=Main+St&daddr=42.973134,-77.85312&hl=en&geocode=FeK4jwIdpPBb-w%3B&mra=mi&mrsp=1,0&sz=19&sll=42.973102,-77.853155&sspn=0.001042,0.001725&ie=UTF8&z=19

NY 78\NY 104 in Wrights Corners (3/10 Mile): http://maps.google.com/maps?f=d&source=s_d&saddr=43.223389,-78.676958&daddr=NY-104+W%2FNY-78+S%2FA%2FLockport+Olcott+Rd&hl=en&geocode=%3BFS54kwIdUnxP-w&mra=dme&mrcr=0&mrsp=0&sz=19&sll=43.223367,-78.676698&sspn=0.001038,0.001725&ie=UTF8&z=19

[NYhwyfan]

Some shorties from NY:

NY 324\US 62 in Amherst (4/10 mile): http://maps.google.com/maps?f=d&source=s_d&saddr=N+Bailey+Ave&daddr=42.980759,-78.822913&hl=en&geocode=FfTTjwIdDGVN-w%3B&mra=mi&mrsp=1,0&sz=15&sll=42.98145,-78.816562&sspn=0.016671,0.027595&ie=UTF8&z=15

NY 5\NY 36 in Caledonia (4/10 Mile): http://maps.google.com/maps?f=d&source=s_d&saddr=Main+St&daddr=42.973134,-77.85312&hl=en&geocode=FeK4jwIdpPBb-w%3B&mra=mi&mrsp=1,0&sz=19&sll=42.973102,-77.853155&sspn=0.001042,0.001725&ie=UTF8&z=19

NY 78\NY 104 in Wrights Corners (3/10 Mile): http://maps.google.com/maps?f=d&source=s_d&saddr=43.223389,-78.676958&daddr=NY-104+W%2FNY-78+S%2FA%2FLockport+Olcott+Rd&hl=en&geocode=%3BFS54kwIdUnxP-w&mra=dme&mrcr=0&mrsp=0&sz=19&sll=43.223367,-78.676698&sspn=0.001038,0.001725&ie=UTF8&z=19

How about
*NY 61 & NY 182 in Niagara Falls, NY (1/10 mi)
https://maps.google.com/maps?saddr=Hyde+Park+Blvd&daddr=Hyde+Park+Blvd&hl=en&ll=43.10844,-79.028563&spn=0.016731,0.038581&sll=43.10844,-79.028563&sspn=0.004183,0.009645&geocode=FfjIkQIdDBhK-w%3BFWzDkQIdeBpK-w&mra=dme&mrsp=1&sz=17&t=m&z=15

*NY 31 & NY 429 in Sanborn, NY  (2/10 mi)
https://maps.google.com/maps?saddr=NY-31+E%2FNY-429+N%2FSaunders+Settlement+Rd&daddr=NY-31+E%2FNY-429+N%2FSaunders+Settlement+Rd&hl=en&ll=43.143521,-78.884668&spn=0.016721,0.038581&sll=43.143677,-78.887908&sspn=0.008361,0.01929&geocode=FVxQkgId4DxM-w%3BFXBQkgIdLVBM-w&t=m&mra=dme&mrsp=0&sz=16&z=15

[bassoon1986]

There's at least two shorter...per LaDOTD shapefiles, US 190/LA 434 in Lacombe is 1,697ft (0.32mi) and US 11/LA 433 in Slidell is 1,653ft (0.31mi).

If LA 151 indeed reaches to the south part of this intersection then it may be a winner...56 feet. 151 is signed as straight ahead on the southern zig zag of 1st street and Hazel st in Arcadia, LA. Cosigned with either US 80 or LA 9.

https://maps.google.com/maps?ll=32.54888,-92.920346&spn=0.001212,0.001754&t=m&z=19



A few others in that region of Louisiana:

LA 5/ LA 3015 in Longstreet...155 feet

https://maps.google.com/maps?ll=32.097495,-93.951328&spn=0.002436,0.003508&t=m&z=18

Alt LA 2 and US 79 in Haynesville...310 feet

https://maps.google.com/maps?ll=32.962762,-93.139121&spn=0.001197,0.001754&t=m&z=19

LA 519 and LA 798-2 in Arcadia...404 feet

https://maps.google.com/maps?ll=32.555319,-92.921736&spn=0.002405,0.003508&t=m&z=18