Two Limited Access Highways Running Side-by-Side

[cbeach40]

In Windsor, ON, Highway 401 and the EC Row Expwy are intertwined but independent for a stretch.
https://www.google.ca/maps/@42.272685,-83.0681648,14.63z?hl=en&hl=en

[skluth]

I-35W runs down the center of I-94 for a bit more than a half mile south of downtown Minneapolis and down the center of MN 62 about west of the airport.

[kurumi]

AZ 143 and former 153 near Sky Harbor Airport in Phoenix.

(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.)

[thspfc]

Not sure if these have been mentioned, but . . .
- I-15 and UT-67 in SLC.
- I-80 (Ohio Pike) and I-271 near Cuyahoga Valley NP.
- Not right next to each other, but I-43/94 and I-794 in Milwaukee are close to each other - about a mile apart at most.

[webny99]

Not sure if these have been mentioned, but . . .

Isn't that what scrolling through / reading the thread is for? 
The first two definitely have been, but I don't see any mention of the Milwaukee example.

[lepidopteran]

In Elyria, OH, I-80/OH-Tpk and I-90/SR-2 are less than a mile apart.  Route 57 has exits with both roads, serving as a Breezewood of sorts for WB I-80 movements.

In at least two locations in Nassau County, NY, the Long Island Expwy and the Northern State Pkwy are separated by little more than a service road.  Route 106 in Jericho has full cloverleaf interchanges with both highways, separated by maybe 200ft.

Similarly, in Queens, or just under 2 miles the Grand Central Pkwy and the Van Wyck Expwy run about 1/4 mile apart.

[Brandon]

How close do they need to be? For example, would I-95 and the Merritt Pkwy be too far apart to qualify?

I would think that if you could throw a baseball from one and hit the nearest lane of the other, that would qualify.

[ilpt4u]

Not Side-by-Side a la I-88/I-355, but one inside the other, I-85 inside I-285 just SW of the ATL airport. And similarly,  I-76 runs inside of I-295 for a short bit in NJ

And, of course, the Dulles Access Rd and the Dulles Toll Road, in Northern VA

[mrsman]

I-95 and I-295 around Richmond, VA - they get pretty close south of Downtown Richmond but don't actually join back for 30 or so miles.

Florida's Turnpike and I-95 are side by side for a while but then diverge. There's no direct connection between them either - very similar situation to I-295 and the NJ Turnpike.

Baltimore-Washington Pkwy and I-95 between Washington, D.C. and Baltimore, MD. Also add US-29 north of the Intercounty Connector to that mix to create three limited-access highways parallel to each other

Here's something interesting to switch it up a bit - a 1.5 mile stretch of Tidewater Drive in Ocean View in Norfolk, VA is a 30-40s style limited-access highway, and parallel to it is the more modern I-64. Technically, it's allowed by the OP as Tidewater Drive is technically a limited-access highway.

I wouldn't include I-95 and BW Parkway.  They are too far apart compared to other examples.  I think to qualify, the edge of one freeway needs to be within 1/4 mile of the edge of the other, literally side by side.

[sprjus4]

I think to qualify, the edge of one freeway needs to be within 1/4 mile of the edge of the other, literally side by side.

Well then good luck getting any submissions... I'm pretty sure all of them have been said then.

[mrsman]

Three examples that I thought of:

I-35E and I-30 in Dallas.  The two roadway mainlines briefly both go under the Houston and Jefferson viaducts separately.  There are also ramp connections as part of the interchange of course.

The sections of I-5 and US 101 in Los Angeles between 4th Street and the merge of I-5 and US 101.  Now it is all part of one big interchange, from my reckoning, US 101 diverges from I-5 at about the Euclid Ave bridge.  The two freeways are closely parallel through the E LA interchange structure, all the way to 4th Street a distance of 1.5 miles.  (At 4th street they are still less than 1/4 mile apart, but 3 city blocks)

In Long Island, there are many sections where I-495 is up close and personal with the Northern Parkway.  One example is the section between Shelter Rock Rd and Willis Ave. in Manhasset.

Another thing that is interesting is that many of the highways listed above involve toll roads.  This is by design, I believe, because of the delays involved in paying tolls through booths, the highway departments wanted to keep the toll traffic away from the free traffic.  So to the extent that the Fl Tpke and I-95 share the same ROW, it does not make sense to join the two roadways to have them diverge later.  Rather, they run as two separate roadways.

[sprjus4]

So to the extent that the Fl Tpke and I-95 share the same ROW, it does not make sense to join the two roadways to have them diverge later.  Rather, they run as two separate roadways.

IIRC, they actually did share the same pavement for a while until they later decided to build I-95 as a new facility due to congestion, and the fact that I-95 traffic dumped onto the Turnpike had to pay the tolls.

Not like this doesn't exist other places though.

[mrsman]

I think to qualify, the edge of one freeway needs to be within 1/4 mile of the edge of the other, literally side by side.

Well then good luck getting any submissions... I'm pretty sure all of them have been said then.

That may very well be the case, a topic like this will have a finite number of answers.

US 29 and I-95 in the MD suburbs of DC are more than 2 miles apart at their closest point, so it really can't qualify under any metric of this subject.

But I thought of a few others:

I-395 and VA 27 by the Pentagon. 
I-66 and Geo Washington Pkwy in Rosslyn, VA.
VA-110 and Geo Washington Pkwy also in the same general area.

Rock Creek Pkwy runs close to I-66 on the DC side, but it's debatable whether this should count as limited access since there are some deficincies in its freeway qualities.

The same can be said for certain Jersey Freeways, like US 46 near I-80 and US 22 near I-78.

Pulaski Skyway and NJTP.

I-80 and I-580 in Richmond, CA.

---------------

It is interesing the way that Fl Tpke and I-95 history have come about.  When planning the interstate system, many northeastern states specifically piggybacked onto the existing turnpikes to avoid having to build new highways on certain corridors.  [Think of I-70 along the Penn Tpke for example.]  In my mind, that would make sense in FL between Palm Beach Gardens and Fort Pierce.  Obviously the part of the roadway that was both I-95 and FL Tpke would have enough lanes to carry the traffic load.  It would force everyone to pay toll, though, and it does eliminate a major shunpiking competition.

A similar idea would not have helped I-295 and NJTP.  In that case, there are too many local exits that the highway authority wanted to serve, making a widening of the NJTP impractical.  If the NJTP were built in the era of electronic tolling, I would imagine that there would not be an I-295 in NJ.  We would instead have a wider NJTP with multiple exits servicing the NJ suburbs of Philly.

[ilpt4u]

There aren't too many California examples of this (I'm very specifically excluding closely parallel freeways like say US 101/I-280 through San Bruno, I-805 and I-5 in San Diego, or 880 and 580 through Oakland), but some do come to mind, mostly due to an older freeway being supplanted by a modern alignment nearby.

- Pacific Highway (former US 101) and I-5/San Diego Freeway near Lindbergh Field (San Diego International Airport)
- Kearny Villa Road (former US 395 and I-15) and modern I-15 through Miramar MCAS
- Oak Grove Drive (former Route 118) and the modern I-210/Foothill Freeway in Altadena

How about I-15 and I-805 in San Diego

[TheStranger]

There aren't too many California examples of this (I'm very specifically excluding closely parallel freeways like say US 101/I-280 through San Bruno, I-805 and I-5 in San Diego, or 880 and 580 through Oakland), but some do come to mind, mostly due to an older freeway being supplanted by a modern alignment nearby.

- Pacific Highway (former US 101) and I-5/San Diego Freeway near Lindbergh Field (San Diego International Airport)
- Kearny Villa Road (former US 395 and I-15) and modern I-15 through Miramar MCAS
- Oak Grove Drive (former Route 118) and the modern I-210/Foothill Freeway in Altadena

How about I-15 and I-805 in San Diego

805 and 15 aren't really parallel though, they cross right before 15 ends in Barrio Logan.

SAMSUNG-SM-G930A

[ilpt4u]

Considering the OP starts off with I-88 and I-355 in Chicagoland (Downers Grove), IL...I-805 and I-15 parallel segment and interchange looks very similar to that of I-355 and I-88, at least on a map anyway

[PHLBOS]

MA 24 and MA 79

I'm not sure if such would count.  I believe the OP's asking for highways that have segments that come very close to another adjacent highway but not ending at such.  The only area where 24 and 79 come close together is at the interchange (Exit 7 off MA 24) where the two routes run concurrently north for about 3 miles.

[NWI_Irish96]

It may be too short for this thread, but I-80/Ohio Turnpike and I-271 run adjacent through the Cuyahoga River valley north of Akron:

https://www.google.com/maps/search/41.252654,+-81.581119?sa=X&ved=2ahUKEwikqtug35fjAhWHGM0KHc3VBMIQ8gEwAHoECAoQAQ

Also, I believe that the Indiana Toll Road and I-80/94 could count between their interchange and I-65.

https://www.google.com/maps/place/41%C2%B034'37.8%22N+87%C2%B015'48.9%22W/@41.577169,-87.2657707,17z/data=!3m1!4b1!4m14!1m7!3m6!1s0x0:0x0!2zNDHCsDE1JzA5LjYiTiA4McKwMzQnNTIuMCJX!3b1!8m2!3d41.252654!4d-81.581119!3m5!1s0x0:0x0!7e2!8m2!3d41.5771649!4d-87.263582

I'm not sure the Toll Road and 80/94 fit the criteria.  They parallel each other for a bit before intersecting, but they aren't close enough to each other to see one from the other.

[StogieGuy7]

I-295 and the New Jersey Turnpike run parallel in several segments east of Camden NJ. They are close enough you can see 295 from the Turnpike.

At their closest point you can't fit a football field width-wise between them.

I remember driving up the NJ Turnpike as a little kid in the backseat during one of our semi-annual visits to New England and one year there was "suddenly" another freeway with brand new signs that you could see from the NJTP.   This was in the early 1970s. Those signs had button-copy because they would sparkle like stars in the early morning light.  That part of the NJTP was lacking in exits or any other points of interest (aside from trees), so I really studied that other road and found it so strange that there was no way to get to it.  You could see it there for a number of miles too.

[StogieGuy7]

There appears to be a new toll road that is soon to open in the western portion of El Paso, TX that runs parallel to I-10 from just west of downtown, through the UTEP area and almost to the New Mexico border.  Brand new signs (with clearview  ) can be seen from I-10.

[kphoger]

There appears to be a new toll road that is soon to open in the western portion of El Paso, TX that runs parallel to I-10 from just west of downtown, through the UTEP area and almost to the New Mexico border.  Brand new signs (with clearview  ) can be seen from I-10.

One better in El Paso:  Texas Loop-375 on the Texas side, Avenida Rafael Pérez Serna on the Mexican side.

[mhking]

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.

[SteveG1988]

I-55/I40 in West Memphis.

[plain]

Would I-376 and PA 885 count?

[SteveG1988]

US1/I295 in Langhorne PA out by Sesame Place