Parallel freeways

[bzakharin]

I-76 and US 30 in PA (where 30 has 2 freeway segments)

[mrsman]

I would add in I-290 (Ike) and I-294 (Tri-State) in the Chicago western suburbs for about 3 miles.  Generally, the two roads go to different places, but these roads are parallel and right next to each other between North Avenue and the Hillside Strangler.

[cl94]

- I-684 and the Taconic in Westchester and Putnam. You could throw in NY 9A/US 9 and the Palisades Parkway as well.
- SOB and Wantagh Parkway in Nassau Couny
- Garden State Parkway and NJ 21/17 in North Jersey
- I-70 and Ohio SRs 161/37/16 east of Columbus
- I-87 and the Taconic in the Hudson Valley. Never more than 20 miles apart, but on opposite sides of the river.

[golden eagle]

Several examples in the south:

- I-40 and US 70 in Arkansas
- I-55 and US 51 in Mississippi
- I-59 and US in Louisiana, Mississippi and Alabama
- I-10 and US 90 along the Mississippi Gulf Coast
- I-20 and US 80 in Mississippi

[jeffandnicole]

I-295 and NJTP

You can even add I-95 into the mix here, as all 3 serve North-South traffic, and are no more than about 10-15 miles apart at most.  Heck, I-95 parallels itself for the time being as both the NJ Turnpike (I-95) from approximately Exit 6 to Exit 8 is parallel with legacy I-95 in PA in the same area.

I-95 and I-895 through the Baltimore area
I-95 and I-495 through Wilmington

(I know this post is about a month old)

x95's shouldn't count for this discussion - they are loops around a city and their very intention is to parallel their 2di counterpart.

[hotdogPi]

x95's shouldn't count for this discussion - they are loops around a city and their very intention is to parallel their 2di counterpart.

They should count. Many are circles or semicircles, which do not parallel.

[vdeane]

Yeah, not all x95s are beltways.  895 is 100% parallel and not remotely circular.  495 is a bypass of downtown for through traffic.  295 is a fully parallel route on the other side of the river, connecting the Delaware Memorial Bridge to Camden and Trenton, never intended to be anything remotely resembling a beltway until the Somerset Freeway was cancelled.

As for the Wantagh and NY 135, the Meadowbrook has always struck me as a counterpart to the Wantagh.

[TheStranger]

Some other California examples:

Route 99 and I-5 between Route 120 in Lathrop/Manteca and US 50 in Sacramento
Route 170/US 101 (Hollywood Freeway, northern segment of Santa Ana Freeway) and I-5 (Golden State Freeway) between the San Fernando Valley and the East Los Angeles Interchange
I-5 and I-805 in San Diego
Would Route 163 and I-15/Route 15 in San Diego count?

Minor examples in the San Diego area:
Friars Road expressway and I-8
Pacific Highway (old US 101) and I-5
Kearny Villa Road (old US 395/I-15) and I-15 through Miramar MCAS
Fairmount Avenue Expressway (old US 395) and Route 15

[jeffandnicole]

I think you took "loop" a little too literally.  The FHWA refers to 3dis as "circumferential, belt, or loop and spur routes" ( http://www.fhwa.dot.gov/planning/national_highway_system/interstate_highway_system/routefinder/index.cfm ). Heck, even our well respected Kurumi uses loop in the sense I was referring to! ( http://www.kurumi.com/roads/3di/ )

Now that we got semantics out of the way, most 3 digit routes with even numbers are generally going to connect with their parent highway on both ends.  Using NJ's I-295 for example, it was going to parallel I-95 in PA and still does; the routes are no more than 10 miles away from each other and can serve the basic needs of many drivers traveling thru the area.  I-895 meets up with I-95 on both ends in Baltimore.  Thus, most 3dis will meet up with the parent twice.  And doing so, unless it takes a long, windy route out of the way, those 3 dis generally parallel the parent, which is why there's no point in listing a 3di as a parallel route to its parent 2di.

Yes, there's some outliers, such as I-476 in PA, which in true form should've been an I-x95 or even an I-x81...and an odd numbered one at that since it spurs away from the main highway, never to return.

[dvferyance]

I-94 and WI-16 in western Waukesha County.

[lordsutch]

Several examples in the south:

- I-40 and US 70 in Arkansas
- I-55 and US 51 in Mississippi
- I-59 and US in Louisiana, Mississippi and Alabama
- I-10 and US 90 along the Mississippi Gulf Coast
- I-20 and US 80 in Mississippi

Virtually none of your US highway examples are actually freeways for any of their length - there's a short US 70 freeway section around Hot Springs that's nowhere near I-40 in Arkansas, and there's a couple of miles of US 51 freeway in Jackson MS, but that's about it.

[SteveG1988]

Pulaski Skyway and I-78/Newark Bay Extension. They both serve the same basic area, both feed to the holland tunnel.

[roadman65]

In Westchester County, NY you have the Taconic Parkway and NY 9A both parallel each other where the short stretch of NY 9A is freeway and of course at that point the Taconic is full freeway as its south of the Reservoir Bridge where there are no at grades there.

[sparker]

Re the I-10/CA 60 parallel cited previously, I'd make that a triple parallel, with CA 134/I-210/CA 210 as the third facility.  Some might even suggest a 4th: CA 91 -- but since that freeway essentially empties out on 91 or 215 well west of the end of other routes, I'd at best consider the addition of 91 to this grouping to bring it up to a "3 1/2 facility" status.     

[mrsman]

Re the I-10/CA 60 parallel cited previously, I'd make that a triple parallel, with CA 134/I-210/CA 210 as the third facility.  Some might even suggest a 4th: CA 91 -- but since that freeway essentially empties out on 91 or 215 well west of the end of other routes, I'd at best consider the addition of 91 to this grouping to bring it up to a "3 1/2 facility" status.     

Part of the problem with this thread is the lack of definition of parallel.  Yes, those roads are parallel, but they are largely far enough apart from each other to make a proper grid of expressways.

[sparker]

True....but in this instance, there is a commonality of overall purpose to these routes -- connection between the "traditional" population/commercial center of the L. A. basin and what is locally termed the "Inland Empire", generally considered to be the western part of San Bernardino and Riverside counties -- and the locale of much of the housing development of the early 2000's.  I lived in Redlands and worked in Ontario from 2003 to 2009 and can attest to a definite synergy between the routes.  In 2007 when 210 was fully completed from 15 to 215,  peak-hour traffic on 10 between those points lessened about 20-25%; but by mid-2008 it had returned to its usual LOS "D" or "F" levels, while 210 was experiencing daily stop-go congestion west of 15 as soon as the extension to 215 opened.  The last time I used those facilities on a regular basis (2012) before moving up to the Bay Area, both 10 and 60 eastbound featured massive congestion starting at a little before 3 p.m. with no letup until about 7:30; 210's congestion level is a little more forgiving (likely a hard "D" LOS), but it starts all the way back on the I-210 segment at or near the I-605 junction and doesn't subside until well past I-15, with the most difficult sections immediately east of CA 57 and then through Claremont and Upland.  None of this is particularly surprising or unexpected; the massive pre-recession "infill" development in the virtually uninterrupted mass of housing that is Rancho Cucamonga, Fontana, and Rialto is having the effect one would expect on all three freeways forming this triplicate facility -- you build it, and they will need a way to come!   

[TheStranger]

The Philippines prior to the late 1990s had no examples of parallel limited access roads, with SLEX and NLEX both radiating away from EDSA for the most part (NLEX directly ending at EDSA, SLEX ending just north of it depending on if the Buendia Flyover counts as part of the road).

1999-present, the first two stages of the Metro Manila Skyway essentially served as an express route above SLEX, originally from Buendia Avenue in Makati to the Bicutan area, and eventually to the Alabang district in Muntinlupa.

With the 2020 opening of Skyway Stage 3, the Skyway now also has a segment parallel to NLEX (running in NLEX's median), between the Balintawak Cloverleaf (NLEX at EDSA) in Quezon City and the NLEX Libis Baesa exit in Caloocan.

In the future (if built), the Port Link Expressway along the Roxas corridor will be parallel to the Skyway, but to the west.   The under-construction NLEX Connector, part of an urban loop with the existing NLEX Harbor Link, could easily be seen as a parallel route to the Skyway-NLEX corridor.


---

Some other California thoughts:

- I-880 and I-680 between San Jose and Route 262.  Had the Route 238 freeway been built between Castro Valley/I-580 and I-680, it would have extended this parallel corridor north to link with the MacArthur Freeway portion of 580.

- Route 87 and US 101 in San Jose

- I-105 and Route 91 in the southern suburbs of Los Angeles County

- Route 55 and Route 57 in Orange County between I-5 and Route 91

- I-405 and Route 170 between I-5 and US 101 in the San Fernando Valley

- I-8 and Route 94 from I-5 in San Diego east towards Route 125

- Route 125 and I-5 and I-805 from Route 54 south towards Route 905

[OCGuy81]

A few come to mind.

I-45 and the Hardy Toll Road in Houston
I-10 and the Westpark Tollway again in Houston
I-95 and Florida's Turnpike in Palm Beach County.

[SkyPesos]

I-64 and I-70 in the St Louis area. Could add in MO 364 as a third parallel west of I-270.

- Route 55 and Route 57 in Orange County between I-5 and Route 91

Thanks for reminding me of a more long-distance example with the route numbers in that post:
I-55 and I-57 between Sikeston and Chicago.

[CoreySamson]

A few come to mind.

I-45 and the Hardy Toll Road in Houston
I-10 and the Westpark Tollway again in Houston
I-95 and Florida's Turnpike in Palm Beach County.

The Westpark near its eastern terminus is also parallel with I-69 for a short period of time whilst being about 500 feet apart.

The Grand Parkway and SH-146 in Baytown is another example.

[TheStranger]

Some more examples I've seen via Google Maps:

- earlier in the thread, someone brought up the DFW Metroplex.  The specific examples (as opposed to north-south or east-west freeways that converge) -

SH 360 and SH 161
SH 121 and SH 161 (between DFW Airport and the Dallas North Tollway)
Dallas North Tollway and US 75 between downtown Dallas and I-635

- in Austin:

MoPac Expressway/SH Loop 1
I-35
SH 130

- In South Florida, SR 826 and the Homestead Extension of the Florida's Turnpike is one example.  SR 112/I-195 and SR 836/I-395 is another.

- In Carmel, Indiana, US 31 and Keystone Parkway (former SR 431)

- in Nashville, I-65 and US 31E/Ellington Parkway (from Briley Parkway/TN 155 south to downtown)

- for a ridiculous example that qualifies, I-175 and I-375 in St. Petersburg

- I-95 and MD 295/Baltimore-Washington Parkway between Baltimore and the Capital Beltway

- I-97 and MD 10 between Brooklyn Park, MD and Pasadena, MD

- I-494, US 169 and MN 100 from I-94 towards Eden Prairie, MN, plus I-35W from I-94 south to I-494

- I-494 and MN 62

- I-94 and MN 36 in St. Paul

- I-35W and MN 77 near Bloomington