Multiplexes on freeways with no exits in between

[SectorZ]

MA 140 hops onto MA 2 (a freeway) for one exit.

But why does MA 140 do this? It could just use MA 2A and W Main St. (I want an answer for this.)

The old 140 that followed that route was moved to get thru traffic off the roads thru the town center. And yes, there is some irony that 2A already does this. W Main St has a truck/commercial vehicle restriction for thru trucks, so I think that is the main reason they did what they did.

Also, MA 2 joins I-91 for a couple miles with no exits between where each side joins.

[Charles2]

Alabama:

I-65 and US 80 between Exits 167 and 168
I-65 and US 31 between Exits 284 and 287
I-65 and AL 69 between Exits 299 and 304
I-20 and US 78 between Exits 153 and 156

[theline]

In Indiana:

IN 331 multiplexes with US 20 for one exit.

Can't think of any other examples right now.

Also, the entire length of I-865 (which has no exits between its termini) multiplexes with US-52. Bonus points?

[pianocello]

In Indiana:

IN 331 multiplexes with US 20 for one exit.

Can't think of any other examples right now.

Also, the entire length of I-865 (which has no exits between its termini) multiplexes with US-52. Bonus points?

I wasn't quite sure to include that since it's the entire length of 865, but hey, it works.

IL-122 and I-155 in Tazewell County, IL have a 3-mile multiplex, and 155 doesn't have any exits in that stretch.
Same goes for I-80 and IA-38 in Cedar County, IA. That one is 4 miles.

[bugo]

I-540/I-49/US 62/US 71/AR 16 in Fayetteville. AR 16 hops onto I-49 for a stretch between exits.

[roadman65]

US 31E near Nashville is concurrent with TN 155 (Briley Parkway) for a stretch without exits.

[WNYroadgeek]

I-86/NY 17 is multiplexed with US 219 between exits 21 and 23 (there's no exit 22) in Salamanca.

[Milepost61]

I-70 and CO 9 from Exit 203 to Exit 205 (Frisco/Silverthorne). Also the only Interstate/CO marked overlap in the state.

[JREwing78]

One in SE Mich:  M-14 multiplexes with US-23 on the north side of Ann Arbor with no exit between the interchanges.

Not quite - you're forgetting Whitmore Lake Rd/Barton Dr:
https://www.google.com/maps/place/Ann+Arbor,+MI/@42.3068121,-83.7435958,3a,75y,196.11h,87.6t/data=!3m4!1e1!3m2!1sLrersYwCgdU8leSECQuRBA!2e0!4m2!3m1!1s0x883cb00dd4431f33:0xdb09f94686c8b5e2

[vtk]

I-70 and I-71, soon, sort of. By the end of this year, the exit to Fourth St will close, leaving no "exits" along the westbound/southbound half of the overlap (though there will still be two entrances). 

As future projects transform the highway, downtown access will shift entirely to the interchanges at either end of the overlap, leaving no exits or entrances between. (Except maybe a single eastbound exit to Parsons Ave; I can't remember if that comes off I-70 upstream or downstream of the I-71 split in the plans, which may change anyway.)

[GaryV]

One in SE Mich:  M-14 multiplexes with US-23 on the north side of Ann Arbor with no exit between the interchanges.

Not quite - you're forgetting Whitmore Lake Rd/Barton Dr:
https://www.google.com/maps/place/Ann+Arbor,+MI/@42.3068121,-83.7435958,3a,75y,196.11h,87.6t/data=!3m4!1e1!3m2!1sLrersYwCgdU8leSECQuRBA!2e0!4m2!3m1!1s0x883cb00dd4431f33:0xdb09f94686c8b5e2

That's on M-14 only, west of the duplex with US-23.

[Roadgeek2500]

US-322 multiplexes with I-95 from exits 3 to 4

[kj3400]

MD 10 and MD 100 multiplex for about a mile in Pasadena.

[SD Mapman]

SD: I-90 and SD 34 (23-30)
I-90 and SD 73 (143-150)
I-90 and SD 63 (163-170)
I-90 and SD 50 (265-272)
I-90 and SD 45 (284-289)
I-90 and SD 37 (330-332)
I-29 and US 18 (59-62)

I don't know what the point of that is.

[PHLBOS]

US-322 multiplexes with I-95 from exits 3 to 4

True for I-95 Northbound, not true for I-95 Southbound; the exit ramp for Highland Ave. (Exit 3B) occurs before US 322 West veers off I-95 at Exit 3A.

[TheStranger]

Just discovered this one while looking at Google Maps:

US 6 and OH 2 between Rye Beach Road (Exit 142) and Fabens Park (Exit 143) in Huron, Ohio:

http://goo.gl/maps/uAvLu

[Pete from Boston]

128/95 are overlapped for one exit by US 3 in Burlington, Mass.

MA 140 hops onto MA 2 (a freeway) for one exit.

But why does MA 140 do this? It could just use MA 2A and W Main St. (I want an answer for this.)

The old 140 that followed that route was moved to get thru traffic off the roads thru the town center. And yes, there is some irony that 2A already does this. W Main St has a truck/commercial vehicle restriction for thru trucks, so I think that is the main reason they did what they did.

140 is more of a through route there than 2A, in that 140 is not a redundant side route.  140 also handles quite a bit of traffic in winter for Mt. Wachusett skiing.  If those coming from the west took Main St., it'd be slower for them and everyone else than if they exited at Exit 25.

[roadman65]

Before the US 202 Parkway in Bucks and Montgomery Counties in PA, US 202 was that way as it was routed on the PA 611 Freeway in Doylestown for several years.

[PHLBOS]

128/95 are overlapped for one exit by US 3 in Burlington, Mass.

Nope.  Middlesex Ave./Exit 32B is situated between where US 3 enters & breaks off I-95.

[Pete from Boston]

128/95 are overlapped for one exit by US 3 in Burlington, Mass.

Nope.  Middlesex Ave./Exit 32B is situated between where US 3 enters & breaks off I-95.

I suppose.  In my head 32A and 32B are one interchange (particularly because they are served by the same exit from 128 to the C/D road) but looking at a map, there is some meaningful amount of separation. 

[PHLBOS]

128/95 are overlapped for one exit by US 3 in Burlington, Mass.

Nope.  Middlesex Ave./Exit 32B is situated between where US 3 enters & breaks off I-95.

I suppose.  In my head 32A and 32B are one interchange (particularly because they are served by the same exit from 128 to the C/D road) but looking at a map, there is some meaningful amount of separation. 

Prior to 1987-88, the US 3 North was Exit 43 and Middlesex Ave. (Turnpike) was Exit 42.

[Brandon]

One in SE Mich:  M-14 multiplexes with US-23 on the north side of Ann Arbor with no exit between the interchanges.

Not quite - you're forgetting Whitmore Lake Rd/Barton Dr:
https://www.google.com/maps/place/Ann+Arbor,+MI/@42.3068121,-83.7435958,3a,75y,196.11h,87.6t/data=!3m4!1e1!3m2!1sLrersYwCgdU8leSECQuRBA!2e0!4m2!3m1!1s0x883cb00dd4431f33:0xdb09f94686c8b5e2

That's BL-23, not US-23.

[Laura]

I was thinking about how I-83 in Baltimore multiplexes with I-695 for about a mile with no exits in between both ends of the multiplex. It hops on and right back off again. Are there any other such multiplexes out there?

The even weirder thing about this multiplex is that I-83 doesn't really "hop on" to I-695. It maintains the same two lanes before and after the multiplex, and I-695 maintains the same three lanes before and after the multiplex. There's no merging involved if you want to stay on I-83.


iPhone

[TEG24601]

I-35E/I-694 MN

And it is/was a pain in the ass, the last time I was there, because 694 dropped into the left lane of I-35E, and you had about 1.5 miles to exit on the right to continue on 694.


US 30 technically multiplexes on I-405 around Portland from I-5 to the Yeon Avenue Exit (originally I-505).


Not to mention the many times that US 30 jumps onto and off of I-84 in Oregon, often for just one exit.

[thenetwork]

Just discovered this one while looking at Google Maps:

US 6 and OH 2 between Rye Beach Road (Exit 142) and Fabens Park (Exit 143) in Huron, Ohio:

http://goo.gl/maps/uAvLu

Meanwhile, on the other side of town (Sandusky), OH-269 multiplexes with OH-2 over the Thomas Edison Bridge and causeway on Sandusky Bay.  OH-269 until the mid 80s followed the old alignment of OH-2 at Danbury, crossing the bay via the old Sandusky Bay lift bridge -- since removed.