Additional lanes that only last through one intersection or interchange

[Jmiles32]

I-74 gains a 3rd lane in each direction at both its interchanges with I-95 and I-85 in North Carolina:
https://www.google.com/maps/@35.9287286,-79.9241253,640m/data=!3m1!1e3?hl=en
https://www.google.com/maps/@34.5931679,-79.1109767,205m/data=!3m1!1e3?hl=en

Only I-95 southbound and I-40 eastbound gain a 3rd lane thru their interchange:
https://www.google.com/maps/@35.3906889,-78.5188903,313m/data=!3m1!1e3?hl=en

US-1 Southbound gains a lane thru its intersection with Harrison Road in Fredricksburg:
https://www.google.com/maps/@38.2641865,-77.4955343,280m/data=!3m1!1e3?hl=en

US-33 Eastbound gains a lane thru its intersection with Stone Spring Road near Harrisonburg:
https://www.google.com/maps/@38.4103942,-78.8309192,3a,42.1y,128.68h,80.92t/data=!3m6!1e1!3m4!1s5UqvS1V-9-pT_joDE2Tn-A!2e0!7i13312!8i6656?hl=en

I suspect with the North Carolina interstate examples this may have something to do with increased safety for merging but I'm not sure. For the Virginia examples, this was probably done with a future widening in mind, however, for both the US-1 and US-33 examples I don't see that happening for a longgg time.

Also to be clear, dimond interchnages like this don't count:
https://www.google.com/maps/@38.8510733,-77.7869643,721m/data=!3m1!1e3?hl=en&authuser=0

Any other examples?

[webny99]

Clague Road at OH 10 west of Cleveland qualifies.
(My goodness - 'scuse the potholes! Detroit level stuff there, especially if you pan across the intersection!)

New York doesn't do this very often, though examples can be found. Here's one (NY 250 and Ayrault Road) where all four approaches get an extra lane through the intersection! The extra lanes extend just far enough in all directions that it's hard to tell from the intersection itself, but I think both roads qualify, so a true double-header!
What is much more common around here is the diamond interchange situation where a 2-lane road bumps up to 4-lanes through the interchange, usually in the absence of turning lanes. I know you said these don't count, so I won't link to any examples - but there are many.

[sprjus4]

I suspect with the North Carolina interstate examples this may have something to do with increased safety for merging but I'm not sure.

They act as collector-distributor roadways in a sense to allow traffic to merge into a lower-speed lane before getting into the main lanes, but there's not enough need to build a full separated C/D lane.

The new NC-11 Southwest Bypass at US-264 in Greenville has a quick 3rd lane addition as well to handle the cloverleaf merging.

[Jmiles32]

Clague Road at OH 10 west of Cleveland qualifies.
(My goodness - 'scuse the potholes! Detroit level stuff there, especially if you pan across the intersection!)

What is much more common around here is the diamond interchange situation where a 2-lane road bumps up to 4-lanes through the interchange, usually in the absence of turning lanes. I know you said these don't count, so I won't link to any examples - but there are many.

Luckily I figured that out at the last second or else I'm sure that's probably what a vast majority of the examples would've been!    Very common here and all throughout the country I'm sure.

Also while I'm at it, heres another example in VA where VA-28 northbound gets a 2nd lane through its intersection with US-17 in Bealeton:
https://www.google.com/maps/@38.582736,-77.7682509,3a,75y,57.61h,95.08t/data=!3m6!1e1!3m4!1szudddu1aGfMpeelgIp5z8Q!2e0!7i13312!8i6656?hl=en&authuser=0

This appears to be a relatively new change as google maps satellite image currently only shows one thru lane.

[Jmiles32]

I suspect with the North Carolina interstate examples this may have something to do with increased safety for merging but I'm not sure.

They act as collector-distributor roadways in a sense to allow traffic to merge into a lower-speed lane before getting into the main lanes, but there's not enough need to build a full separated C/D lane.

Gotcha thank you for the clarification.

The new NC-11 Southwest Bypass at US-264 in Greenville has a quick 3rd lane addition as well to handle the cloverleaf merging.

It appears that US-264 itself at this interchange also has one westbound as well. 

[sprjus4]

It appears that US-264 itself at this interchange also has one westbound as well.

Yes, that one as well. I don't know if they added one for the road coming out of Greenville (the one that turns into US-264 east of the interchange), I only know of the NC-11 one after reviewing dashcam footage from driving through there a few months ago and indeed seeing it open up to 3 lanes at the merge at least on the northbound lanes. Somebody would have to confirm or we'll have to wait for Street View.

[Elm]

If I'm understanding correctly, there are a handful of examples of intersections like this in Boulder County, Colorado.

Near Gunbarrel, the Diagonal Highway gets an extra lane in each direction at the 63rd St intersection; there are also bus queue jump lanes.

In north Boulder, US 36 gets an extra lane around Broadway.

West of Niwot, Hwy 52 expands to four lanes around US 287

East of Boulder, Hwy 7 (Arapahoe Rd) gains lanes for the 75th St intersection.

Near Louisville, Hwy 47 adds lanes around Baseline Rd. Further south, it gets extra lanes in the vicinity of South Boulder Rd, but those cross a few more intersections. Further south again, the same road (as 96th St) adds lanes through the Dillon Rd intersection, and Dillon Rd does, too.


Also, a "˜maybe' and some "˜not quite':

Outside of Boulder County, something that might qualify–but stretches "intersection" –is US 85 around a gated turnoff that crossing the railroad, here. The extra lanes aren't around long enough to be very useful as passing lanes (plus people rarely keep right).

Another US 36 case that came to mind, but turns out not to really qualify, is further north; it extra lanes around the Lefthand Canyon Dr intersection; when CDOT replaced the bridge south of it, though, they extended the southbound extra lane so it becomes a right turn lane. Also, I forgot about the Plateau Dr intersection.

Also crossing extra intersections, in Colorado Springs, Astrozon Blvd gets extra lanes around Academy Blvd and around Powers Blvd; those were carried over from its pre-diet days, when it was four lanes between Academy and Powers.

[deathtopumpkins]

I-93 northbound in Salem, NH gains a 4th lane on the right just before the state welcome center, only to have that lane end 3/4 mile later just past the gore at Exit 1.

The Everett Turnpike does similar around exits 10 and 11. A third lane is added at or just after the gore for one exit, then dropped just past the gore for the next.

The road then widens from 4 to 6 lanes south of exit 13, before narrowing again north of the interchange and toll plaza (this is a more "pure" example for this thread). This means that northbound you have 3 main lanes plus 2 added lanes from the onramp dropping down to 2 lanes in quick succession.



Off freeways, MA has a particular fondness for widening 2-lane roads to 4-lane at signalized intersections, only to quickly narrow back to 2 lanes, e.g. MA 125 at Mass Ave in North Andover: https://goo.gl/maps/4d4HGLLbAuRJQR7E6 or MA 125 at Gould Rd: https://goo.gl/maps/6BE39tqJP5EjEDTT7
Marked as 2 lanes approaching the intersection for roughly 100-200 ft. Originally only marked as 1 lane on the far side with an immediate lane ends sign, recent practice has been to stripe a second lane for 100-200 ft. These can be found all over the commonwealth, sometimes even in quick succession.

[1995hoo]

The Inner Loop of I-495 in Virginia gains a fifth lane when the ramp from eastbound I-66 merges onto the highway; that lane then becomes exit-only a little over a mile to the north of there at the next interchange with VA-7. The fifth lane was added as part of the HO/T lane construction because so much traffic goes from I-66 to Tysons Corner, which is served by the VA-7 interchange.

[Jmiles32]

The Inner Loop of I-495 in Virginia gains a fifth lane when the ramp from eastbound I-66 merges onto the highway; that lane then becomes exit-only a little over a mile to the north of there at the next interchange with VA-7. The fifth lane was added as part of the HO/T lane construction because so much traffic goes from I-66 to Tysons Corner, which is served by the VA-7 interchange.

^ and yet for some odd reason the same wasn't done in the opposite direction and IMO, along with the short weave area between the US-50 and Gallows Road interchanges, is a big chokepoint and cause for afternoon delays.

Wouldn't personally count this example though because of how that 5th lane acts more as a gloried auxiliary lane and doesn't actually extend through either the I-66 or VA-7 interchanges.

[Mapmikey]

Both MD 2 and MD 260 do this at their intersection.  Further north MD 2 and MD 256 both do it at their intersection.
https://goo.gl/maps/edUz4oMfgbH1nTGVA

MD 2 does this at MD 423, with no stoplight at the intersection...
https://goo.gl/maps/Cr1MmosdSzsD62bM7

[sprjus4]

The Inner Loop of I-495 in Virginia gains a fifth lane when the ramp from eastbound I-66 merges onto the highway; that lane then becomes exit-only a little over a mile to the north of there at the next interchange with VA-7. The fifth lane was added as part of the HO/T lane construction because so much traffic goes from I-66 to Tysons Corner, which is served by the VA-7 interchange.

That would simply be an auxiliary lane, not necessarily an "added lane"  since it doesn't travel through any interchanges, just simply between them.

[CNGL-Leudimin]

Several interchanges in China do this. They are widening many expressways to 2x4, and new interchanges are built in preparation for such widenings. Sometimes they even go from 2 lanes to 4 just for the exit, back to 2, again to 4 during the subsequent merge and finally back to 2, as it happens where G6 and G7 finally split near Linhe/Bayannur, Inner Mongolia.

[Jmiles32]

US-60 gains a 3rd westbound lane through its intersection with Stavemill/Luck Stone Road in Powhatan County, Virginia:
https://www.google.com/maps/@37.5115665,-77.7746605,294m/data=!3m1!1e3?hl=en

[CoreySamson]

Here's an interesting one: SH-35 at FM 523

https://www.google.com/maps/@29.2028884,-95.3945201,18z/data=!3m1!1e3

Both roads are usually two lane roads but both gain an additional lane in both directions through the intersection.

FM 523 also does this again at its intersection with SH-288B a few miles away, as well.

https://www.google.com/maps/@29.2030957,-95.4340714,19z/data=!3m1!1e3

[kurumi]

I thought this would be easier to find in CT, where most surface routes are 2 lanes unless extremely necessary, and widenings tend to be small in scale.

There's a "wide spot in the road", 4 thru lanes for both routes, at the 218/185 intersection in Bloomfield near the West Hartford Line: https://goo.gl/maps/McAkUPGfEvRRmZNm7. 185 west and 218 south peter out pretty quickly (in 218's case, you get two dashed lines and that's it). But 185 to the east lasts for a block and 218 to the north almost makes it to the next intersection with 4 thru lanes.

[Jmiles32]

US-250 gains a 2nd lane in each direction at its intersection with US-15 at Zion's Crossroads:
https://www.google.com/maps/@37.9699812,-78.2187118,428m/data=!3m1!1e3?hl=en&authuser=0

[ozarkman417]

In addition to one of the deepest rock cuts in the State of Missouri, US 160 gains an extra lane at the intersection with US 65.

On US 50 in Western Illinois there are two instances of this, in Trenton and Breese respectively.

[Brandon]

I-80 gains a lane only for going over the Des Plaines River and through the Chicago Street (US-52/IL-53) interchange in Joliet.
https://goo.gl/maps/FtZ7aY1Hxoc1Nk4t9

A fair number of city streets in Chicago mysteriously gain a lane through an intersection (from one lane to two), only to have it drop right after the intersection.  Examples:
https://goo.gl/maps/jZcCKTcbqvL6RbNNA
https://goo.gl/maps/oQnv7WSXeGYwDdr1A
https://goo.gl/maps/YRR5pZaWXxMQcq1j9

[Jmiles32]

Can't believe I forgot this one in my own backyard but Devlin Road/Balls Ford Road gains a 2nd lane in each direction thru its intersection with Wellington Road:
https://www.google.com/maps/@38.7839589,-77.5648256,883m/data=!3m1!1e3

Won't be around for much longer tho as Balls Ford Road north of Wellington road is to be widened and relocated to a new interchange with VA-234 by early 2023. I guess one could argue that Wellington Road does the same thing westbound although that example is somewhat iffy IMO due to the length.

[RG407]

In the 70's and 80's Florida did this for most surface roads at their interchanges with interstate highways... I-75 in Southwest Florida; I-95 in Central Florida and the northern parts of South Florida; I-10 in the panhandle.  The surface road was rural and two lanes until it approached the interstate where it was widened to four-land divided, then dropped back to two lanes after the interstate.

Along I-75 and I-95, the areas have developed enough that the two-land roads aren't two lanes anymore, but there's still plenty of examples along I-10.

[Hwy 61 Revisited]

In the 70's and 80's Florida did this for most surface roads at their interchanges with interstate highways... I-75 in Southwest Florida; I-95 in Central Florida and the northern parts of South Florida; I-10 in the panhandle.  The surface road was rural and two lanes until it approached the interstate where it was widened to four-land divided, then dropped back to two lanes after the interstate.

Along I-75 and I-95, the areas have developed enough that the two-land roads aren't two lanes anymore, but there's still plenty of examples along I-10.

The same thing happens with PA 115 and I-80 near Blakeslee, though it's more of a parclo. The two lanes are quickly dropped.

[sprjus4]

Also to be clear, dimond interchnages like this don't count:
https://www.google.com/maps/@38.8510733,-77.7869643,721m/data=!3m1!1e3?hl=en&authuser=0