Interchanges between two lane roads

[sprjus4]

Three exist on the AR-549 in Belle Vista, AR - https://www.google.com/maps/@36.4420245,-94.352826,7194m/data=!3m1!1e3

One exists on I-93 through Franconia Notch, VT - https://www.google.com/maps/@44.1704517,-71.6834394,802m/data=!3m1!1e3

One exists on US-11 in Lexington, VA - https://www.google.com/maps/@37.7899331,-79.4294657,442m/data=!3m1!1e3

Four exist on the Colonial Pkwy in Williamsburg, VA - https://www.google.com/maps/@37.2736756,-76.6898176,7116m/data=!3m1!1e3

One exists on NC-49 near Denton, NC - https://www.google.com/maps/@35.5586377,-80.09751,3638m/data=!3m1!1e3!5m1!1e1

[ozarkman417]

Three exist on the AR-549 in Belle Vista, AR - https://www.google.com/maps/@36.4420245,-94.352826,7194m/data=!3m1!1e3

One exists on I-93 through Franconia Notch, VT - https://www.google.com/maps/@44.1704517,-71.6834394,802m/data=!3m1!1e3

One exists on US-11 in Lexington, VA - https://www.google.com/maps/@37.7899331,-79.4294657,442m/data=!3m1!1e3

Four exist on the Colonial Pkwy in Williamsburg, VA - https://www.google.com/maps/@37.2736756,-76.6898176,7116m/data=!3m1!1e3

One exists on NC-49 near Denton, NC - https://www.google.com/maps/@35.5586377,-80.09751,3638m/data=!3m1!1e3!5m1!1e1

The one at AR-549 exists because it will one day be I-49 (if MO would build their portion...)

SM-G965U

[TEG24601]

OR-43 and the Sellwood Bridge - https://goo.gl/maps/s9GbFA8ygrt5G9yG8 (This new interchange is so much boring from the original)


US-101 and SR 104 near Discovery Bay, WA - https://goo.gl/maps/CLu6aQUYhztjVqNq7

[Bickendan]

SR 42 and the Powers Highway in Coos County OR, just east of Myrtle Point.

US 101 and SR 18 in Lincoln County, just north of Lincoln City OR.

US 101 and the road which leads to the Rogue Hills development just north of Gold Beach OR.

ODOT had a "thing" going for a while it appears!

Rick

Also US 101 and US 26 in Seaside. And multiple interchanges (3 of them, but 2 of them have involve a RIRO, and one of those allows left turns) on the Cannon Beach bypass just to the south.

And US 97 at OR 206

More in Oregon: US 30 exit 73, between Astoria and Clatskanie
NE Marine Dr at 223rd Ave (allegedly - I should scout this one)

[Beltway]

Wyola, PA
Wyola is an unincorporated community in Delaware County
Interchange between PA-252 and St. Davids Road
https://www.google.com/maps/place/Wyola,+PA+19073/@40.0079911,-75.4193771,1402m/data=!3m1!1e3!4m5!3m4!1s0x89c6eb6938b832ff:0x5dff34f663b8bad7!8m2!3d40.0081654!4d-75.418529

I see that they now have a roundabout just east of the interchange.

[froggie]

Since it hasn't been mentioned yet, I'll include MN 55/MN 28 near Glenwood.

[PHLBOS]

Wyola, PA
Wyola is an unincorporated community in Delaware County
Interchange between PA-252 and St. Davids Road
https://www.google.com/maps/place/Wyola,+PA+19073/@40.0079911,-75.4193771,1402m/data=!3m1!1e3!4m5!3m4!1s0x89c6eb6938b832ff:0x5dff34f663b8bad7!8m2!3d40.0081654!4d-75.418529

Personally, I wouldn't necessarily consider such to be included for two reasons:

1.  PA 252 is a divided roadway.
2.  PA 252 in this area wasn't originally a 2-laner.  Even today, the lower portion of the northbound stretch is still striped as 2-lanes; for a total of 3 lanes overall.

I see that they now have a roundabout just east of the interchange.

Oldest GSV from that area is 2012 & shows the roundabout.  My guess is that such was added sometime during the prior decade.

[Plutonic Panda]

Will we ever get a stack interchange between two super-2s? That would be cool.

[Hot Rod Hootenanny]

Wyola, PA
Wyola is an unincorporated community in Delaware County
Interchange between PA-252 and St. Davids Road
https://www.google.com/maps/place/Wyola,+PA+19073/@40.0079911,-75.4193771,1402m/data=!3m1!1e3!4m5!3m4!1s0x89c6eb6938b832ff:0x5dff34f663b8bad7!8m2!3d40.0081654!4d-75.418529

Personally, I wouldn't necessarily consider such to be included for two reasons:

1.  PA 252 is a divided roadway.
2.  PA 252 in this area wasn't originally a 2-laner.  Even today, the lower portion of the northbound stretch is still striped as 2-lanes; for a total of 3 lanes overall.

I see that they now have a roundabout just east of the interchange.

Oldest GSV from that area is 2012 & shows the roundabout.  My guess is that such was added sometime during the prior decade.

Historic Aerials/NETR Onlines of that intersection/interchange show that it's been 4 lanes (for through traffic) since 1967.

[jakeroot]

US-101 and SR 104 near Discovery Bay, WA - https://goo.gl/maps/CLu6aQUYhztjVqNq7

Several others in WA:

* the SPUI at SR-522 and Fales Road near Monroe: https://goo.gl/maps/7diRdWyyEixYDUjK7
* US-2 and 88 St SE near Snohomish: https://goo.gl/maps/Gr8oS249jj8m8nxq8
* US-2 and SR-9 near Snohomish: https://goo.gl/maps/4SYAZmwMacDgTsRC7 (may not count as Hwy 2 transitions to 4-lane divided beneath the overpass)
* US-2 and US-97 northwest of Wenatchee: https://goo.gl/maps/JWYZcCUmcyvCYRHQ6

[ozarkman417]

There are several along US 400 in Kansas. Some include: US-400xUS-59 in Parsons, US-400xUS-169, and US-400xUS-75.

There is another one at US-65xMO-83 in Warsaw, MO (but 65 turns in to a divided highway once it crosses the Osage River). I would like to see that highway upgraded to four lanes between Warsaw & Buffalo, then it will be four lanes from Harrison AR to Marshall, MO/I-70.

[roadman65]

There are several along US 400 in Kansas. Some include: US-400xUS-59 in Parsons, US-400xUS-169, and US-400xUS-75.

There is another one at US-65xMO-83 in Warsaw, MO (but 65 turns in to a divided highway once it crosses the Osage River). I would like to see that highway upgraded to four lanes between Warsaw & Buffalo, then it will be four lanes from Harrison AR to Marshall, MO/I-70.

The US 54 & 400 split in Mullinville is one you did not mention.

[froggie]

Will we ever get a stack interchange between two super-2s? That would be cool.

Highly unlikely.  Any volume of traffic that would warrant a stack with all 4 quadrant flyovers would also likely require at least 4 lanes on each mainline.

[jakeroot]

Will we ever get a stack interchange between two super-2s? That would be cool.

Highly unlikely.  Any volume of traffic that would warrant a stack with all 4 quadrant flyovers would also likely require at least 4 lanes on each mainline.

The closest thing I can think of to such a setup, would be US-2 and WA-204 east of Everett. It's not a full stack, but it has characteristics of a stack. It does not qualify for this thread however, as two of the approaches are divided carriageway.

Google Maps: https://maps.app.goo.gl/6ZZQ39hSsYdz4Df87

[Plutonic Panda]

Will we ever get a stack interchange between two super-2s? That would be cool.

Highly unlikely.  Any volume of traffic that would warrant a stack with all 4 quadrant flyovers would also likely require at least 4 lanes on each mainline.

Or perhaps geographical constraints could warrant a stack having it being cheaper than a cloverleaf bearing expensive demolition of any nearby elevated land. This seems like a more likely scenario to occur in the NE and would obviously need to be two super-2s that cross over each other yet current don't connect or a future super two built over an existing one.

[Beltway]

Wyola, PA   Wyola is an unincorporated community in Delaware County  Interchange between PA-252 and St. Davids Road

Personally, I wouldn't necessarily consider such to be included for two reasons:
1.  PA 252 is a divided roadway.
2.  PA 252 in this area wasn't originally a 2-laner.  Even today, the lower portion of the northbound stretch is still striped as 2-lanes; for a total of 3 lanes overall.

Good points, but I wondered back in the 1970s when I lived in the area why they built an interchange there? 

Traffic wasn't all that heavy there back then.  Arterial interchanges were very rare in PA back then, it wasn't a strategic intersection, and north of there it was just a 2-lane highway.

[roadman65]

I

Wyola, PA   Wyola is an unincorporated community in Delaware County  Interchange between PA-252 and St. Davids Road

Personally, I wouldn't necessarily consider such to be included for two reasons:
1.  PA 252 is a divided roadway.
2.  PA 252 in this area wasn't originally a 2-laner.  Even today, the lower portion of the northbound stretch is still striped as 2-lanes; for a total of 3 lanes overall.

Good points, but I wondered back in the 1970s when I lived in the area why they built an interchange there? 

Traffic wasn't all that heavy there back then.  Arterial interchanges were very rare in PA back then, it wasn't a strategic intersection, and north of there it was just a 2-lane highway.

The same goes for US 6 and NY 293 east of Harriman.  Why they need an interchange there when few vehicles go between US 6 and NY 293 to warrant a trumpet that is laid out all wrong.  US 6 should be the main body of it, but EB US 6 to EB NY 293 and WB NY 203 to WB US 6 is the main stem while US 6 exits itself going EB with the majority of the traffic and going WB US 6 merges into the road that NY 293 ends at with more cars merging. 

Bad planning in some cases.

[Beltway]

The same goes for US 6 and NY 293 east of Harriman.  Why they need an interchange there when few vehicles go between US 6 and NY 293 to warrant a trumpet that is laid out all wrong.  US 6 should be the main body of it, but EB US 6 to EB NY 293 and WB NY 203 to WB US 6 is the main stem while US 6 exits itself going EB with the majority of the traffic and going WB US 6 merges into the road that NY 293 ends at with more cars merging.   Bad planning in some cases.

The Wyola interchange meets (and did so back then) traffic warrants for benefitting from a grade separation there, it was not a waste.  Just that for PA it was an extravagance.

[PHLBOS]

Historic Aerials/NETR Onlines of that intersection/interchange show that it's been 4 lanes (for through traffic) since 1967.

Not quite.  The land was being cleared for such back then.  The 1971 Aerial shows the fully-completed interchange.

Wyola, PA   Wyola is an unincorporated community in Delaware County  Interchange between PA-252 and St. Davids Road

Personally, I wouldn't necessarily consider such to be included for two reasons:
1.  PA 252 is a divided roadway.
2.  PA 252 in this area wasn't originally a 2-laner.  Even today, the lower portion of the northbound stretch is still striped as 2-lanes; for a total of 3 lanes overall.

Good points, but I wondered back in the 1970s when I lived in the area why they built an interchange there? 

Traffic wasn't all that heavy there back then.  Arterial interchanges were very rare in PA back then, it wasn't a strategic intersection, and north of there it was just a 2-lane highway.

Based on Historic Aerials, the interchange has existed since 1971.

As for why was such constructed that way early on... such may have been part of an initial plan to upgrade PA 252 into a 4-lane divided highway that never fully materialized.  Keep in mind, due to the absence of I-476 at the time; roads like PA 252 & 320 likely saw more through-traffic usage.

Side bar: how long has Episcopal Academy been there (west of the interchange)?

[Plutonic Panda]

Will we ever get a stack interchange between two super-2s? That would be cool.

Highly unlikely.  Any volume of traffic that would warrant a stack with all 4 quadrant flyovers would also likely require at least 4 lanes on each mainline.

The closest thing I can think of to such a setup, would be US-2 and WA-204 east of Everett. It's not a full stack, but it has characteristics of a stack. It does not qualify for this thread however, as two of the approaches are divided carriageway.

Google Maps: https://maps.app.goo.gl/6ZZQ39hSsYdz4Df87

Interesting. Are there plans to expand the super two setup further east on US-2?

[jemacedo9]

Historic Aerials/NETR Onlines of that intersection/interchange show that it's been 4 lanes (for through traffic) since 1967.

Not quite.  The land was being cleared for such back then.  The 1971 Aerial shows the fully-completed interchange.

Wyola, PA   Wyola is an unincorporated community in Delaware County  Interchange between PA-252 and St. Davids Road

Personally, I wouldn't necessarily consider such to be included for two reasons:
1.  PA 252 is a divided roadway.
2.  PA 252 in this area wasn't originally a 2-laner.  Even today, the lower portion of the northbound stretch is still striped as 2-lanes; for a total of 3 lanes overall.

Good points, but I wondered back in the 1970s when I lived in the area why they built an interchange there? 

Traffic wasn't all that heavy there back then.  Arterial interchanges were very rare in PA back then, it wasn't a strategic intersection, and north of there it was just a 2-lane highway.

Based on Historic Aerials, the interchange has existed since 1971.

As for why was such constructed that way early on... such may have been part of an initial plan to upgrade PA 252 into a 4-lane divided highway that never fully materialized.  Keep in mind, due to the absence of I-476 at the time; roads like PA 252 & 320 likely saw more through-traffic usage.

Side bar: how long has Episcopal Academy been there (west of the interchange)?

PA 252 south starting at that interchange is a 4 lane arterial...and has been as long as I can remember (late 80s?)

[Beltway]

Based on Historic Aerials, the [Wyola] interchange has existed since 1971.
As for why was such constructed that way early on... such may have been part of an initial plan to upgrade PA 252 into a 4-lane divided highway that never fully materialized.  Keep in mind, due to the absence of I-476 at the time; roads like PA 252 & 320 likely saw more through-traffic usage.
Side bar: how long has Episcopal Academy been there (west of the interchange)?

I first drove it in fall of 1972, and I don't recall any school there then.  I did think about the absence of I-476 then, but it was in planning since 1956, and based on how PA-252 curves to the northwest, I am unsure as to how much traffic relief that I-476 would provide to PA-252.

PennDOT did spend a fortune to build the interchange at PA-320 and US-1 in the late 1970s, and while that was a very congested intersection, that was directly relievable by the planned I-476.

[froggie]

Will we ever get a stack interchange between two super-2s? That would be cool.

Highly unlikely.  Any volume of traffic that would warrant a stack with all 4 quadrant flyovers would also likely require at least 4 lanes on each mainline.

Or perhaps geographical constraints could warrant a stack having it being cheaper than a cloverleaf bearing expensive demolition of any nearby elevated land. This seems like a more likely scenario to occur in the NE and would obviously need to be two super-2s that cross over each other yet current don't connect or a future super two built over an existing one.

Again, doubtful.  If traffic volumes were low enough that they wouldn't need 4 lanes and there were geographical constraints, a tight diamond would more than suffice.  Even a double-trumpet if the goal was fully-controlled access for both roadways...but again volumes warranting that would most likely warrant 4 lanes to begin with.

I also can't think of anywhere offhand in New England where such would be warranted.

[vdeane]

The same goes for US 6 and NY 293 east of Harriman.  Why they need an interchange there when few vehicles go between US 6 and NY 293 to warrant a trumpet that is laid out all wrong.  US 6 should be the main body of it, but EB US 6 to EB NY 293 and WB NY 203 to WB US 6 is the main stem while US 6 exits itself going EB with the majority of the traffic and going WB US 6 merges into the road that NY 293 ends at with more cars merging.

Bear in mind that US 6 east of there is the Long Mountain Parkway (leading to an overlap with the Palisades Interstate Parkway) and is restricted to passenger cars only.  Not to mention, current NY 293 was the routing of US 6 before the Long Mountain Parkway was!

[jakeroot]

Will we ever get a stack interchange between two super-2s? That would be cool.

Highly unlikely.  Any volume of traffic that would warrant a stack with all 4 quadrant flyovers would also likely require at least 4 lanes on each mainline.

The closest thing I can think of to such a setup, would be US-2 and WA-204 east of Everett. It's not a full stack, but it has characteristics of a stack. It does not qualify for this thread however, as two of the approaches are divided carriageway.

Google Maps: https://maps.app.goo.gl/6ZZQ39hSsYdz4Df87

Interesting. Are there plans to expand the super two setup further east on US-2?

My understanding is that WSDOT wants to extend the freeway portion of US-2 all the way past Monroe, via a new bypass. The interchanges along the current stretch of the super-2 were built to support this.

If you look at a map of the area, WA-522 in Monroe ends at US-2. the idea is for this freeway to be extended to meet the bypass. I think with a roundabout at first, but then full interchanges later.