Side by side freeways.

[TheStranger]

Interstate 15 and former Interstate 15/US 395 (Kearny Villa Road) at Miramar MCAS in San Diego.

[Joe The Dragon]

I was just wondering how many examples of interstates or freeways that run directly next to each other or on the same ROW for some distance without actually sharing pavement. Both I-88/I-355 and I-290/I-295 in Chicagoland are the first to come to mind. What other examples of this setup are out there? I guess examples such as the way Atlanta's southern leg of I-85 sits in the median of I-285 or how I-10 and I-45 straddle and weave inbewteen each other for a mile or two in Houston can be included as well.

 

It's I-294 not I-295

[cpzilliacus]

Do "dual dual" freeways count?

Like the New Jersey Turnpike between (soon) Exit 6 and Exit 15E - and, of course, north of there are the "East Spur" and "West Spur" of the Turnpike.

Or the Garden State Parkway between Neptune/Asbury Park and the N.J. Turnpike.

Or I-270 in Montgomery County, Maryland?

Or I-271 in Cleveland, Ohio?

Or I-95/I-495 between Virginia Exit 176 and Maryland Exit 3?

[ET21]

I-88 and I-355 for about 1 mile in Downers Grove, IL

I-294 and I-290 for about 1 mile in Hillside, IL. 294 does a slight curve to go under St Charles Rd, but it is parallel to 290 between the Hillside JCT and North Ave (IL-64)

[JustDrive]

I-5 truck lanes and the mainline lanes between CA 14 and I-210

[jeffandnicole]

Do "dual dual" freeways count?

Like the New Jersey Turnpike between (soon) Exit 6 and Exit 15E - and, of course, north of there are the "East Spur" and "West Spur" of the Turnpike.

Or the Garden State Parkway between Neptune/Asbury Park and the N.J. Turnpike.

Or I-270 in Montgomery County, Maryland?

Or I-271 in Cleveland, Ohio?

Or I-95/I-495 between Virginia Exit 176 and Maryland Exit 3?

I may be mistaken, but I think the NJ Turnpike is the only dual-dual roadway, which allows traffic from either the inner or outer drive to access all exits and rest areas/service plazas.  The other roadways are highways with express/local lanes.

[Dr Frankenstein]

A-20 and A-40

They do serve a different set of communities that are separated by a river... but they are indeed somewhat side-by-side in Montreal, especially in the West Island. That's a bit of an edge case though, isn't it?

[PHLBOS]

Has anyone mentioned I-95 and Florida's Turnpike?

The very 2nd post by jeffandnicole

A portion of I-81 & I-476 (PA Turnpike Northeast Extension) between Wilkes-Barre & Scranton, PA

Although one is a Jersey/arterial type freeway, I-95 & US 1 in Peabody & Danvers, MA.

[dgolub]

I-684 and the Saw Mill Parkway in Katonah, NY.

[jp the roadgeek]

I-87 and the Saw Mill Parkway in Ardsley.
Northern State Parkway and the LIE near North Hills

[thenetwork]

Do "dual dual" freeways count?

Like  I-271 in Cleveland, Ohio?

I'll say yes...but only for the part of the I-271 express lanes that run inside of I-90 from the split to east of SR-91.

ODOT, on the other hand, considers that stretch a very long "transition ramp" as they mark the END of both I-271 Local & Express at the same point a few miles before I-271 Express officially dumps onto I-90 East.

[UptownRoadGeek]

I never realized I-295 served Chicago 

It's I-294 not I-295

Typo people, damn.

[elsmere241]

US 13 and Delaware 1 in several places, and not just where they cross.

[mgk920]

I-35W and I-94 straddle each other for several blocks in Minneapolis, MN.

Mike

[Doctor Whom]

VA 27 and I-395

[ethanhopkin14]

If you are talking about dual freeways, you have to talk about ON-401 in the. Toronto area.

Honorable mention: Not anywhere near being the same ROW, but I-64 and I-44 parallel for a few miles in Saint Louis and they are less than a half a mile apart.

[PColumbus73]

Personally, I wouldn't consider express/local setups, because they are the same highway. I-35W inside I-94 in Minneapolis would count, but I wouldn't count the I-271 Express/Local lanes

[1995hoo]

I-85 and US-74 at that weird interchange near Gastonia might qualify: http://goo.gl/maps/FCqbM

[HurrMark]

Even though there is a river in between them, the Major Deegan and Harlem River Drive.

[NE2]

The Ventura Freeway and Kujukuri Toll Road.

[PurdueBill]

They missed a chance with 271/480 to have a side-by-side setup...there is space and even grading for a local/express type setup in the overlap area but it could have been 480 on the outside and 271 on the inside. 

[roadman65]

I-90 and I-790 in NY.
I-295 and the NJT in NJ.
US 9 and the Garden State Parkway across the Raritan River.  Then even north of there the GSP is inside US 
   9 for about a mile in NJ also.

[dgolub]

The Belt Parkway and the Nassau Expressway (NY 878) by Kennedy Airport.

[vdeane]

A-20 and A-40

They do serve a different set of communities that are separated by a river... but they are indeed somewhat side-by-side in Montreal, especially in the West Island. That's a bit of an edge case though, isn't it?

I was thinking specifically of the west Montreal segments.