Two Limited Access Highways Running Side-by-Side

[TheGrassGuy]

East of Xi'an, we have G40 in close proximity to... G40?! Huaxuzhen
Lantian, Xi'an, Shaanxi, China
https://maps.app.goo.gl/9XFReE44ZFAMmH1y9

[TheGrassGuy]

I-81 and I-476 in the Scranton area also come to mind.

[TheGrassGuy]

For about a mile, I-85 runs in what is essentially the median of I-285 southwest of Atlanta Hartsfield-Jackson Airport with connector/feeder ramps outside of the two in an insane basket-weave with each other and with Ga. 14 on the west end - and an exit for Old National Highway (Ga. 279) in the middle of it all.

I-85 and GA 13 on the other side of Atlanta

[CNGL-Leudimin]

They already mentioned here in Europe there are lots of examples. The first one that came to my mind was AP-7 and A-2 near Barcelona.

Another example that quickly came to mind is G4 and S1 near Zhengzhou, Henan, China.

(slight derail: in Japanese, 空 means sky (or empty, etc.), and 港 means harbor. Combine them, and 空港 means airport, so Sky Harbor Airport would be 空港空港.)

Same in Chinese, but Sky Harbor Airport would be 空港机场 instead, the last two characters meaning literally "machine field".

East of Xi'an, we have G40 in close proximity to... G40?! Huaxuzhen
Lantian, Xi'an, Shaanxi, China
https://maps.app.goo.gl/9XFReE44ZFAMmH1y9

It's G40 and G70 nearby. Although I don't know how that is signed. Possibly the Southern, older expressway has been demoted to national highway G312, and both G40 and G70 (an useless concurrency, as G40 ends in Xi'an with G70 continuing to Yinchuan) are now in the Northern, newer expressway (a 2x4 no less, they are popping up all over China now).

[crispy93]

The Belt Parkway and 278 are kind of parallel in Bay Ridge, Brooklyn. Also the Southern State and Sunrise Highway in Islip.

Slightly unrelated, in Pleasantville, NY, when on the southbound Taconic, northbound 9A/100 appears on the right making it look like the Taconic's carriageway is on the "wrong" side: https://www.google.com/maps/@41.1244756,-73.809883,3a,69.1y,161.26h,90.04t/data=!3m6!1e1!3m4!1stwD1jiwAIH9cf7fW9Irgew!2e0!7i16384!8i8192

[TheGrassGuy]

It's not very visible from here (screw you, Google Maps), but "Middle Ring Rd South Line" in Kunshan, Jiangsu, China is a free urban-maintained limited-access highway running parallel to G2/G42, two tolled national expressways in a multiplex.
https://www.google.com/maps/@31.3437714,120.913297,12z

[X99]

Do limited-access at-grade expressways count? If so, I-90 and CR 1416 in Box Elder, South Dakota, the former of which replaced the latter.

[TheGrassGuy]

Do limited-access at-grade expressways count? If so, I-90 and CR 1416 in Box Elder, South Dakota, the former of which replaced the latter.

What's up with the giant median of the latter?

[Roadsguy]

Do limited-access at-grade expressways count? If so, I-90 and CR 1416 in Box Elder, South Dakota, the former of which replaced the latter.

What's up with the giant median of the latter?

The westbound lanes seem to be newer construction. Perhaps they were originally planning on running I-90 on CR 1416 and building a new eastbound carriageway in the median, with the existing carriageway becoming a frontage road for the south side.

[X99]

Do limited-access at-grade expressways count? If so, I-90 and CR 1416 in Box Elder, South Dakota, the former of which replaced the latter.

What's up with the giant median of the latter?

The westbound lanes seem to be newer construction. Perhaps they were originally planning on running I-90 on CR 1416 and building a new eastbound carriageway in the median, with the existing carriageway becoming a frontage road for the south side.

A look at Historic Aerials shows that both sides are roughly the same age. From what I heard, the wide median was put in place to allow large trucks to turn off onto other roads without their trailers blocking the through lanes.
The current plan is to rebuild the road as a three-lane undivided, I think off of the westbound carriageway, with the eastbound one removed. In my opinion, it should be five-lane undivided, since all four lanes are utilized during rush hour. Exit 63 also needs to be rebuilt since it only serves one direction, but the current plans for the interchange show 1416 with nearly all of its wide median intact, becoming a four-lane undivided road through the West Gate Road intersection and the interchange.

[Some one]

I-69/US 59 and Westpark Tollway are parallel for about 5-6 miles.

I-30 and Chrisholm Trail Parkway are also paralleled for a bit.

I-10 and I-45 are intertwined for a little bit in downtown Houston

[TheGrassGuy]

Mods, I propose a merge with this thread. It's more general.

[sprjus4]

Mods, I propose a merge with this thread. It's more general.

The two topics are different.

This one is regarding two separate facilities that run near each other, the other is regarding one facility with multiple carriageways carrying different designations.

[TheGrassGuy]

Mods, I propose a merge with this thread. It's more general.

The two topics are different.

This one is regarding two separate facilities that run near each other, the other is regarding one facility with multiple carriageways carrying different designations.

I know. But the topic of this thread has turned out to be a subtopic of my thread, and it looks like we're citing the same examples, such as I-85 and I-285 in Atlanta.

[sprjus4]

I know. But the topic of this thread has turned out to be a subtopic of my thread, and it looks like we're citing the same examples, such as I-85 and I-285 in Atlanta.

This thread was here long before the one you linked was. Also... your thread?

[Ketchup99]

Northern State Pkwy and I-495 on Long Island are 150 feet apart at one point.

[TheStranger]

Here's one that I've actually posted a lot about on these forums, yet hadn't thought of putting in this thread until now:

the South Luzon Expressway and the southern portion of the Metro Manila Skyway, in southern Metro Manila (essentially from the west edge of the city of Makati to the Alabang district in the suburb of Muntinlupa).

https://www.google.com/maps/search/Buendia+Avenue+%26+South+Superhighway,+Makati/@14.5556947,121.0089281,16.96z

It's actually an intriguing example for a few key reasons:

- the original Skyway section from Alabang to Buendia (Gil Puyat) Avenue in Makati is essentially similar in function to say the express lanes of the NJTP or the elevated HOV/bus lanes of the Harbor Freeway in south central Los Angeles (or for another example, the Dulles Toll Road vs. Dulles Greenway).  This IIRC will also be true for the segment of the Skyway being built south of Alabang.

- However, the portions of Stage 3 of the Metro Manila Skyway that exist north of Buendia Avenue (from there to the current north terminus in the Paco district of Manila, and eventually to the final north terminus in the Balintawak area of Quezon City at the North Luzon Expressway) are much more like say the Gowanus section of I-278 in Brooklyn or the former Cypress Freeway portion of I-880 in Oakland, a standalone viaduct using primarily the rights-of-way of the existing street grid below.  The permanent north terminus for SLEX is at Buendia Avenue, where it becomes the surface boulevard Osmena Highway.

- The future north terminus of the Metro Manila Skyway may be set up similarly as a median route like the SLEX segment, as I recall that the terminus won't be the Balintawak cloverleaf itself but maybe a mile north of EDSA at a separate interchange with NLEX.

[TheGrassGuy]

Here's one that I've actually posted a lot about on these forums, yet hadn't thought of putting in this thread until now:

the South Luzon Expressway and the southern portion of the Metro Manila Skyway, in southern Metro Manila (essentially from the west edge of the city of Makati to the Alabang district in the suburb of Muntinlupa).

https://www.google.com/maps/search/Buendia+Avenue+%26+South+Superhighway,+Makati/@14.5556947,121.0089281,16.96z

It's actually an intriguing example for a few key reasons:

- the original Skyway section from Alabang to Buenia (Gil Puyat) Avenue in Makati is essentially similar in function to say the express lanes of the NJTP or the elevated HOV/bus lanes of the Harbor Freeway in south central Los Angeles (or for another example, the Dulles Toll Road vs. Dulles Greenway).  This IIRC will also be true for the segment of the Skyway being built south of Alabang.

- However, the portions of Stage 3 of the Metro Manila Skyway that exist north of Buendia Avenue (from there to the current north terminus in the Paco district of Manila, and eventually to the final north terminus in the Balintawak area of Quezon City at the North Luzon Expressway) are much more like say the Gowanus section of I-278 in Brooklyn or the former Cypress Freeway portion of I-880 in Oakland, a standalone viaduct using primarily the rights-of-way of the existing street grid below.  The permanent north terminus for SLEX is at Buendia Avenue, where it becomes the surface boulevard Osmena Highway.

- The future north terminus of the Metro Manila Skyway may be set up similarly as a median route like the SLEX segment, as I recall that the terminus won't be the Balintawak cloverleaf itself but maybe a mile north of EDSA at a separate interchange with NLEX.

Wowzers! So in the sections like the NJTP, there are really six lanes: two express, two local, and two service roads for each direction. Always imagined there existing some sort of setup like that somewhere, yet couldn't name a real-world example till now.

As for the type north of Buendia Ave, however, those are actually very common in Shanghai, China, and some other nearby cities. They are known as elevated roads, and they have characteristic green-on-white signs (as opposed to white-on-green for regular expressways). Here in our country, though, they're harder to find (and for good reason too ). I guess the closest approximation you'll get to their frequency in China would be in Texas (where nearly every freeway has service roads), New York City, or New Orleans, but that isn't as true of an approximation of the majority of elevated roads in Shanghai (except for maybe the Middle Ring Rd and Wuzhou Ave, and even then, they don't have "elevated" in their correct names).