US 49 and 64 duplex for about 175 feet according to Google Maps. Here (http://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&q=wynne.+ar&sll=36.092118,-95.962988&sspn=0.006658,0.020514&ie=UTF8&hq=&hnear=Wynne,+Cross,+Arkansas&ll=35.251906,-91.029244&spn=0.0017,0.005128&t=k&z=18) is a view of the intersection. They duplex long enough to cross the railroad tracks and that's it.
Are there any shorter duplexes?
That might be the shortest out there. I know US-40 and PA-381 multiplex for about 217 ft per Google.
http://maps.google.com/maps?f=d&source=s_d&saddr=Farmington-Ohiopyle+Rd%2FPA-381+S&daddr=39.807061,-79.566261&geocode=FStoXwId1u1B-w%3B&hl=en&mra=mi&mrsp=1,0&sz=19&sll=39.807193,-79.565349&sspn=0.001508,0.003484&ie=UTF8&ll=39.806993,-79.565893&spn=0.001508,0.003484&z=19
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.
Florida 437 and 438 multiplex for 0.1 miles (http://maps.google.com/maps?f=d&source=s_d&saddr=Co+Rd+437%2FOcoee+Apopka+Rd&daddr=Co+Rd+437%2FOcoee+Apopka+Rd&geocode=FWr5swEdsqIj-w%3BFar_swEdiqIj-w&hl=en&mra=ls&sll=28.573529,-81.550347&sspn=0.001477,0.00327&ie=UTF8&t=h&z=18) (a total of two blocks). This is the only section of SR 437 still in the state system; the rest is County or decommissioned.
http://www.southeastroads.com/florida400/fl-437_nb_fl-438_eb_after_merge.jpg
Georgia State Routes 20 and 212 merge together shortly in Newton County, just south of the Rockdale County line. This duplex might be a tenth to two-tenths of a mile long.
S.R. 20/212 duplex (http://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&q=Conyers,+Georgia&sll=37.0625,-95.677068&sspn=33.764224,74.179688&ie=UTF8&hq=&hnear=Conyers,+Rockdale,+Georgia&ll=33.547583,-84.016829&spn=0,0.01811&z=16&layer=c&cbll=33.547497,-84.016802&panoid=m5m_xTAI2g8IrEi_tOrBlw&cbp=12,198.85,,0,8.99)
Be well,
Bryant
California's shortest (signed) concurrency can be found in Redding, at the west end of Route 44:
http://maps.google.com/maps?f=d&source=s_d&saddr=40.586696,-122.390195&daddr=Eureka+Way&hl=en&geocode=%3BFfZRawIdi3G0-A&mra=dme&mrcr=0&mrsp=0&sz=17&sll=40.586867,-122.391225&sspn=0.004172,0.006663&ie=UTF8&z=17
The shortest duplex that is not signed is Route 271 and Route 1 in Leggett, at 341 feet:
http://maps.google.com/maps?f=d&source=s_d&saddr=CA-1+S%2FCA-271+S&daddr=39.868131,-123.713543&hl=en&geocode=FTBXYAIdSEOg-A%3B&mra=mi&mrsp=1,0&sz=17&sll=39.868205,-123.714155&sspn=0.004216,0.006663&ie=UTF8&z=17
(Route 271 has an unsigned nine-mile concurrency with US 101 from Leggett north to Reynolds, at US 101 Exit 625)
M-35 and CR 492 in Negaunee Township duplex to cross railroad tracks and skirt around a house, and M-35 yields the right of way to the county road in the process. According to MDOT's Physical Reference Finder, the duplex is between MPs 126.715—126.744 on M-35, making it a total of 0.029 miles, or 153 feet.
http://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&q=Negaunee,+MI&sll=37.0625,-95.677068&sspn=64.409204,65.654297&ie=UTF8&hq=&hnear=Negaunee,+Marquette,+Michigan&ll=46.51226,-87.53372&spn=0.006977,0.008014&t=h&z=17 (http://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&q=Negaunee,+MI&sll=37.0625,-95.677068&sspn=64.409204,65.654297&ie=UTF8&hq=&hnear=Negaunee,+Marquette,+Michigan&ll=46.51226,-87.53372&spn=0.006977,0.008014&t=h&z=17)
So far, looks like VA 178/180 still has "the title"...
US 31 and Shelby County 52 multiplex for roughly a block in Pelham.
CR 526 has two really short concurrences in its travels through Central Jersey:
- With NJ 33 in Robbinsville, officially .03 miles (158.4 ft), possibly less if traveling east (http://maps.google.com/maps?q=40.217586,-74.62594&num=1&t=k&sll=37.0625,-95.677068&sspn=23.875,57.630033&ie=UTF8&ll=40.217586,-74.625838&spn=0.001573,0.003484&z=19)
- With CRs 524 and 539 in Allentown, officially .02 mi (105.6 ft) (http://maps.google.com/maps?q=40.177886,-74.584154&num=1&t=k&sll=40.217381,-74.625275&sspn=0.001573,0.003484&ie=UTF8&ll=40.177906,-74.583891&spn=0.001574,0.003484&z=19)
http://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&q=Lycippus,+PA&sll=37.0625,-95.677068&sspn=49.089956,79.013672&ie=UTF8&hq=&hnear=Lycippus,+Pennsylvania&ll=40.229677,-79.430144&spn=0.005824,0.013733&t=h&z=17 (http://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&q=Lycippus,+PA&sll=37.0625,-95.677068&sspn=49.089956,79.013672&ie=UTF8&hq=&hnear=Lycippus,+Pennsylvania&ll=40.229677,-79.430144&spn=0.005824,0.013733&t=h&z=17)
In the tiny Western PA village of Lycippus, PA-982 and PA-130 duplex for just a couple of feet. I suppose if the traffic volume warranted it, PennDOT could just make it a single-point intersection, but I doubt that will happen.
VA 42 Bus and VA 257 might be slightly shorter than VA 178-180
Each direction of US 33 duplexes with US 11 NB in a way that looks in the ballpark of 100 ft or so.
Historically in Virginia it may be the original US 15-211 duplex in downtown Warrenton on Alexandria St between Main/Waterloo and Winchester St. Shown as 0.01 in the traffic log and looks to be under 50 ft
http://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&q=Warrenton,+VA&sll=37.0625,-95.677068&sspn=52.505328,90.175781&ie=UTF8&hq=&hnear=Warrenton,+Fauquier,+Virginia&ll=38.714175,-77.794932&spn=0.001595,0.002752&t=h&z=19
Mapmikey
Co-curator Virginia Hwys Project
www.vahighways.com
What would the shortest Interstate duplex be? I'd guess I-5 and I-10 in LA (about a mile or so from merge point to exit), or if you believe Google Maps, I-44 and I-55, also right around a mile, but I don't remember if 44 is technically a duplex with 55 right after the bridge in St. Louis. Hard to imagine there are shorter, given the amount of space you'd need to get signage and leave room for merging, etc
Quote from: RustyK on May 17, 2010, 12:01:04 PM
What would the shortest Interstate duplex be? I'd guess I-5 and I-10 in LA (about a mile or so from merge point to exit), or if you believe Google Maps, I-44 and I-55, also right around a mile, but I don't remember if 44 is technically a duplex with 55 right after the bridge in St. Louis. Hard to imagine there are shorter, given the amount of space you'd need to get signage and leave room for merging, etc
I-87 and I-90 in Albany I think is the shortest, at 1/3 mile:
http://maps.google.com/maps?f=d&source=s_d&saddr=Unknown+road&daddr=42.696473,-73.842587&hl=en&geocode=FRiQiwIdpjWZ-w%3B&mra=dme&mrcr=0&mrsp=1&sz=15&sll=42.693792,-73.834949&sspn=0.020692,0.03283&ie=UTF8&z=15
US 19 South and I-285 West come to mind as about 3/4 a mile and it's really not even signed except on GA 400, which says use Exit 4-something. Maybe it's just a link and not a true duplex.
US 20A\NY 39 and NY 36 in Leicester is only 1/10 of a mile: http://maps.google.com/maps?f=d&daddr=42.696473,-73.842587&hl=en&geocode=FRiQiwIdpjWZ-w;&mra=dme&mrcr=0&mrsp=1&sz=15&sll=42.693792,-73.834949&sspn=0.020692,0.03283&z=15&um=1&ie=UTF-8&sa=N&tab=wl
QuoteWhat would the shortest Interstate duplex be?
It'd be a toss-up between the I-87/I-90 Albany example already mentioned and I-35E/I-94 in St. Paul, MN. Depending on how you measure them, they both measure out to roughly the same...definitely within any margin-of-error. Then there's which set of numbers you go by. MnDOT officially considers the 35E/94 duplex is only 0.117 mile. FHWA officially considers it 0.27 mile, but FHWA doesn't list the 87/90 duplex. And NYSDOT (via their traffic log) even lists different mileages for the 87/90 duplex, depending on whether you're looking at the I-87 entry (0.54mi), or the I-90 entry (0.25mi).
The shortest in Louisiana may be LA 2/US 71 near Hosston (1/2 mile)
http://maps.google.com/maps?f=d&source=s_d&saddr=US-71+N&daddr=LA-2+W%2FUS-71+S&geocode=FcDj9QEddodn-g%3BFajG9QEdeoZn-g&gl=us&hl=en&mra=ls&sll=32.886939,-93.875427&sspn=0.021695,0.032916&ie=UTF8&z=16
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).
Quote from: froggie on May 23, 2010, 09:12:44 AM
QuoteWhat would the shortest Interstate duplex be?
It'd be a toss-up between the I-87/I-90 Albany example already mentioned and I-35E/I-94 in St. Paul, MN. Depending on how you measure them, they both measure out to roughly the same...definitely within any margin-of-error. Then there's which set of numbers you go by. MnDOT officially considers the 35E/94 duplex is only 0.117 mile. FHWA officially considers it 0.27 mile, but FHWA doesn't list the 87/90 duplex. And NYSDOT (via their traffic log) even lists different mileages for the 87/90 duplex, depending on whether you're looking at the I-87 entry (0.54mi), or the I-90 entry (0.25mi).
Don't forget 76/80. That's only about 1000 feet (0.19 miles).
That may be a roadgeek thing, but it may not even officially count, depending on if ODOT (and/or FHWA) measure by roadway centerline. They could officially consider the two routes touching, but not duplexing, based on where the turnpike bridges over the freeway.
Quote from: froggie on May 23, 2010, 03:11:42 PM
That may be a roadgeek thing, but it may not even officially count, depending on if ODOT (and/or FHWA) measure by roadway centerline. They could officially consider the two routes touching, but not duplexing, based on where the turnpike bridges over the freeway.
Otherwise one would have to include the I-74/80 bump over by the Quad cities as well.
Quote from: osu-lsu on May 23, 2010, 09:52:02 PM
Otherwise one would have to include the I-74/80 bump over by the Quad cities as well.
Nope. Nowhere in that interchange to the two highways actually share pavement.
Look:
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fimg688.imageshack.us%2Fimg688%2F2218%2F8074.png&hash=6e9693dc0c9630c2f261989c6e51b2bf23c920cc)
CR 569 and US 202 (NJ) - barely 100 ft on 569 SB/202 NB, about twice that in the other direction.
Here is a jog of TN SSR 247 in Spring Hill:
http://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&q=Spring+Hill,+TN&sll=37.0625,-95.677068&sspn=47.569986,53.173828&ie=UTF8&hq=&hnear=Spring+Hill,+Maury,+Tennessee&ll=35.752701,-86.927972&spn=0.001543,0.003484&t=h&z=19&layer=t
It is roughly 100 ft. To measure properly, use the satellite view as the map is a bit off and makes it longer.
It is signaled, basically, as one intersection and the duplex is unsigned. Actually, it can be hard to know that 247 continues on both sides of 31.
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
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
nice U-turn for US-50 there!
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.
Quote from: OracleUsr on July 22, 2010, 01:40:35 PM
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.)
Quote from: agentsteel53 on July 22, 2010, 01:37:11 PM
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).
I'm surprised they didn't just multiplex 40 and 50, like they did with 60 and 70.
Quote from: agentsteel53 on July 22, 2010, 01:59:56 PM
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. :-D
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!
Quote from: agentsteel53 on July 22, 2010, 01:48:31 PM
Quote from: OracleUsr on July 22, 2010, 01:40:35 PM
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
What about I-84 and US-44 on the Bulkeley Bridge in Hartford? It's about 1100 feet.
Quote from: froggie on May 16, 2010, 09:48:49 AM
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! :D
I have to learn GIS projections before I get any more precise. :(
I-76 and I-80 share pavement at the Ohio Turnpike Exit 216 toll booth.
Wrong-way`plex, no less. Sneaky! Could that be the shortest wrong-way`plex on the I-system?
Possibly the ONLY wrong-way plex on the system. Certainly the only one I can think of offhand.
Quote from: froggie on July 25, 2010, 09:58:12 PM
Possibly the ONLY wrong-way plex on the system. Certainly the only one I can think of offhand.
Forget I-77 and I-81?
Quote from: froggie on July 25, 2010, 09:58:12 PM
Possibly the ONLY wrong-way plex on the system. Certainly the only one I can think of offhand.
isn't 77/81 backwards?
How about I-80/I-580 in Oakland, CA?
And, I-26/I-240 in Asheville, NC
Quote from: The Premier on July 25, 2010, 11:35:58 AM
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/
^^^
What about I-680? Is it's zero mile marker on the toll or free side of the booths?
Quote from: mightyace on July 26, 2010, 07:44:50 PM
^^^
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. :sombrero:
Quote from: thenetwork on July 26, 2010, 08:56:06 PM
Quote from: mightyace on July 26, 2010, 07:44:50 PM
^^^
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. :sombrero:
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.
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
Quote from: WNYroadgeek on July 29, 2010, 12:23:38 AM
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
Quote from: froggie on May 23, 2010, 09:44:04 AM
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
Hwys 108 and 271, Saint-Éphrem-de-Beauce, QC: 81 metres.
Hwys 133 and 227, Saint-Sébastien, QC: 28 metres.
Honorary mention must go out to the I-5/I-10 duplex in downtown Los Angeles, which is less than one mile in length but which carries more traffic than any other duplex in the USA.
Quote from: StogieGuy7 on September 21, 2012, 03:49:42 PM
Honorary mention must go out to the I-5/I-10 duplex in downtown Los Angeles, which is less than one mile in length but which carries more traffic than any other duplex in the USA.
It looks like I-75/I-85 and I-405/SR 22 carry more.
How about CR 524, 526, 539 (https://maps.google.com/maps?q=allentown+nj&hl=en&ll=40.17834,-74.584669&spn=0.004418,0.00883&sll=40.305614,-74.515929&sspn=0.00882,0.01766&hnear=Allentown,+Monmouth,+New+Jersey&t=m&z=17) in Allentown, NJ?
Now wait, what is this Alps Bistro business? :D
Wonder if FL80 and FL29 are technically duplexed for what appears to be one block; SR29 intersects 80 in LaBelle, then shifts one block to continue north or south. It's probably 300 feet or so, but not signed.
Not sure of the exact distance, but the duplex of LA 25 and LA 40 in Folsom is extremely short, about a block or two.
LA 1203 and US 71 between Tioga and Pineville, LA. Unsigned, but LA 1203 does follow US 71 for about 50 feet or so.
K-7 and K-31 in Bourbon County are concurrent for less than a full mile. But I don't know the actual distance. I can't think of any shorter in Kansas now. There were two that I remember that were a block or less before the routes were changed: U.S. 54/U.S. 169/K-57 in Iola were together for one block and if U.S. 154/K-154 officially ended at U.S. 50 rather than U.S. 56/283, then it's concurrency with 56/283 was less than a full block.
Nevada does not allow state highways to overlap any other routes, so the only overlaps that exist are U.S. Routes onto other U.S. routes or or Interstate highways.
The shortest of these overlaps in Nevada is US 95's short overlap on US 50 in Fallon, NV. The US 95 alignment shifts over about 1/4 mile east using US 50 in the center of town.
Any other US highway overlapping with an US/Interstate highway in Nevada lasts a distance of several miles.
The shortest one I can think of is US 23 SB* with US 33 EB along Livingston Ave in Columbus, at about 400 feet.
The shortest one on a freeway I can think of is OH 16 EB and OH 37 EB near Granville, for about 850 feet. (The westbound counterpart is 1000 feet longer.)
The shortest one I can think of that doesn't involve one-way halves of routes is OH 38 and OH 161 at Chuckery, (west of Plain City), at about 1000 feet.
Quote from: bassoon1986 on September 21, 2012, 01:40:16 PM
Quote from: froggie on May 23, 2010, 09:44:04 AM
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
Googlemaps is not quite correct. US 80 WEST/LA 9 NORTH (1st St.) actually continues straight ahead and doesn't zig-zag. The street represented a block up is US 80 WEST TRUCK ROUTE/LA 798-1 (2nd St.). So the multiplex is actually between LA 151 & US 80 TRUCK ROUTE.
On the west side of Ruston, LA, LA 818 multiplexes with US 80 for about 1/10th of a mile.
Shortest in California is in Redding - Route 44's concurrency with Route 273 between 44's western terminus at Route 299, and Tehama Street:
http://maps.google.com/maps?q=Redding&hl=en&ll=40.586956,-122.38821&spn=0.012922,0.017145&sll=37.269174,-119.306607&sspn=13.851002,17.556152&hnear=Redding,+Shasta,+California&t=m&z=16
Eastbound the concurrency is 4 blocks, westbound just 2.
as far as I can tell, New Mexico has one state route multiplex: route 9 jogs along route 338 for one block in Animas.
http://goo.gl/maps/dTqoq
Google Maps gives no finer granularity than 0.1 mile, but it looks to be about 400 feet.
Quote from: TheStranger on October 10, 2012, 11:53:14 AM
Shortest in California is in Redding - Route 44's concurrency with Route 273 between 44's western terminus at Route 299, and Tehama Street:
http://maps.google.com/maps?q=Redding&hl=en&ll=40.586956,-122.38821&spn=0.012922,0.017145&sll=37.269174,-119.306607&sspn=13.851002,17.556152&hnear=Redding,+Shasta,+California&t=m&z=16
Eastbound the concurrency is 4 blocks, westbound just 2.
Shorter than I-680/SR 84?
Quote from: NE2 on October 10, 2012, 11:59:57 AM
Quote from: TheStranger on October 10, 2012, 11:53:14 AM
Shortest in California is in Redding - Route 44's concurrency with Route 273 between 44's western terminus at Route 299, and Tehama Street:
http://maps.google.com/maps?q=Redding&hl=en&ll=40.586956,-122.38821&spn=0.012922,0.017145&sll=37.269174,-119.306607&sspn=13.851002,17.556152&hnear=Redding,+Shasta,+California&t=m&z=16
Eastbound the concurrency is 4 blocks, westbound just 2.
Shorter than I-680/SR 84?
According to Google Maps, that one in Sunol (which only applies to eastbound 84 and northbound 680) is 0.3 mile...
while in comparison, the westbound 44/northbound 273 concurrency in Redding is 0.2 mile. (Eastbound is longer, at 0.3 mile)
The 44/273 duplex only dates back to 2002 (when 299 was rerouted to use Lake Boulevard and 44 given the entire mainline of the east-west freeway into town), so based on Historicaerials shots, 84/680 was the shortest from about 1966 until then.
Quote from: vtk on September 24, 2012, 12:23:29 AM
The shortest one I can think of that doesn't involve one-way halves of routes is OH 38 and OH 161 at Chuckery, (west of Plain City), at about 1000 feet.
OH 16 and OH 310 are duplexed for around 600 feet in Pataskala.
US 130 and US206 in NJ, no interaction other than both going through the same area. I think it is 1 mile at most. But it probably carries a ton of traffic as the two routes cross over each other.
In South Bend, EB Business US 20 and SB SR 933 share a one-block concurrency on Main St., a one-way street. They have no concurrency in the other direction. How's that for an oddity?
Quote from: theline on October 11, 2012, 03:36:19 PM
In South Bend, EB Business US 20 and SB SR 933 share a one-block concurrency on Main St., a one-way street. They have no concurrency in the other direction. How's that for an oddity?
I'd have to think that is more common than you think because sometimes, a one-way pair begins at an intersection, which requires you to go over a block. Anyway, the intersection is usually a major road through a city, which can often be a state highway. I think the southern end of Illinois Route 70 overlaps with westbound Business Route 20 in Rockford, in a way similar to your example. I thought I've seen another example of that somewhere but can't place it at the moment.
what about any multiplexes arising from two perpendicular roads meeting in a roundabout? by necessity, certain quadrants of the roundabout will carry both - in one direction only.
Quote from: agentsteel53 on October 11, 2012, 07:41:06 PM
what about any multiplexes arising from two perpendicular roads meeting in a roundabout? by necessity, certain quadrants of the roundabout will carry both - in one direction only.
That depends on how one interprets the roundabout geometry. In most modern roundabouts where the radial roads form angles near 90 degrees, I interpret it like a closely spaced group of four yield-controlled intersections. If two routes cross at such a roundabout, my interpretation says the routes cross, not overlap. On the other hand, if you increase the angular size of one "quadrant" to more than about 120 degrees, the intersection in that quadrant is stretched out and becomes two, and there may be overlap of routes between them. Adding a fifth road to the roundabout would ensure the existence of an overlap between two crossing routes.
US 78/SC 39 in Williston, S.C. duplexes for about 0.2 miles. From the Price Wise to the BP. That's it.
The duplex itself is not signed. All of the signage is on either terminus of the duplex.
Quote from: vtk on October 11, 2012, 11:23:22 PM
Quote from: agentsteel53 on October 11, 2012, 07:41:06 PM
what about any multiplexes arising from two perpendicular roads meeting in a roundabout? by necessity, certain quadrants of the roundabout will carry both - in one direction only.
That depends on how one interprets the roundabout geometry. In most modern roundabouts where the radial roads form angles near 90 degrees, I interpret it like a closely spaced group of four yield-controlled intersections. If two routes cross at such a roundabout, my interpretation says the routes cross, not overlap. On the other hand, if you increase the angular size of one "quadrant" to more than about 120 degrees, the intersection in that quadrant is stretched out and becomes two, and there may be overlap of routes between them. Adding a fifth road to the roundabout would ensure the existence of an overlap between two crossing routes.
Roundabouts are typically considered "intersections", not a separate roadway. So I would agree with the concept of the roads "crossing". Put another way: I wouldn't dream of posting a reassurance marker on the roundabout itself, so neither would I consider it to be a duplex.
Quote from: kphoger on October 12, 2012, 01:49:51 PM
Roundabouts are typically considered "intersections", not a separate roadway. So I would agree with the concept of the roads "crossing". Put another way: I wouldn't dream of posting a reassurance marker on the roundabout itself, so neither would I consider it to be a duplex.
generally, an overlap of fewer than N blocks does not get a reassurance, where N is for sure greater than 2, and probably as much as 6-7.
the large roundabout in Boise City, Oklahoma has been discussed elsewhere as having the most routes multiplexed. none are multiplexed solely through the circle, though, as no route goes through east-west. 385 goes through north-south.
I get it that duplex reassurances are not actually signed for distances that short, but I find it believable that one might exist somewhere. However, I find the idea of a duplex being signed on an actual roundabout quite unbelievable.
The "roundabout" in Boise City is not a proper modern roundabout, and I would in fact not consider that to be one intersection. I drove a very similar traffic circle in Benton (IL) almost daily for some time; it was an uncontrolled circle, with nobody having a yield sign to anybody else, and had very high traffic volume. Nobody knew exactly what to do, whether to go or yield. I started treating it as an arrangement of four T intersections, thereby giving the circulation right of way and an implied yield to all approaches. To me, this makes more sense than counting it as one big intersection with a building in the middle. So, in the case of Boise City, I would consider each bend in the "circle" to be a multiplex of approximately one block (half a block one direction, then a 90° bend and half a block in the next direction).
I can't believe i forgot US 80 & LA 154 in Gibsland, LA.... 1/10th mile.