Highway concurrencies that run on separate lanes

[TheGrassGuy]

US-22 and GSP in Union, NJ

[cbeach40]

In Windsor, ON, Highway 401 shares right-of-way with both Highway 3 and the EC Row Expressway.
https://www.google.ca/maps/@42.251671,-83.0447198,13.88z?hl=en

[bzakharin]

I-76/NJ42 and I-295 in NJ.

These haven't been concurrent since the barriers went up between them years ago.

[webny99]

I-76/NJ42 and I-295 in NJ.

These haven't been concurrent since the barriers went up between them years ago.

But the barriers are likely the reason it qualifies for this thread in the first place.

[sprjus4]

I-76/NJ42 and I-295 in NJ.

These haven't been concurrent since the barriers went up between them years ago.

Hence the reason it was posted in this thread.

Highway concurrencies that run on separate lanes

[BrianP]

I-76/NJ42 and I-295 in NJ.

These haven't been concurrent since the barriers went up between them years ago.

Hence the reason it was posted in this thread.

Highway concurrencies that run on separate lanes

Then it's not a concurrency.  Since that requires that they be on the same roadway. 
https://en.wikipedia.org/wiki/Concurrency_(road)

A concurrency in a road network is an instance of one physical roadway bearing two or more different route numbers.

These instead are braided or inner/outer highways. But the route numbers do not share a roadway so they are not a concurrency.

This thread subject is an oxymoron. It's asking for something which can't occur.

My interpretation is that it is effectively asking for two highways that do not form a concurrency but do share the same ROW.

[sprjus4]

Then it's not a concurrency.  Since that requires that they be on the same roadway. 
https://en.wikipedia.org/wiki/Concurrency_(road)

A concurrency in a road network is an instance of one physical roadway bearing two or more different route numbers.

These instead are braided or inner/outer highways. But the route numbers do not share a roadway so they are not a concurrency.

This thread subject is an oxymoron. It's asking for something which can't occur.

My interpretation is that it is effectively asking for two highways that do not form a concurrency but do share the same ROW.

No need to get technical. You understand the point of the thread. Same ROW.

[BrianP]

Then it's not a concurrency.  Since that requires that they be on the same roadway. 
https://en.wikipedia.org/wiki/Concurrency_(road)

A concurrency in a road network is an instance of one physical roadway bearing two or more different route numbers.

These instead are braided or inner/outer highways. But the route numbers do not share a roadway so they are not a concurrency.

This thread subject is an oxymoron. It's asking for something which can't occur.

My interpretation is that it is effectively asking for two highways that do not form a concurrency but do share the same ROW.

No need to get technical. You understand the point of the thread. Same ROW.

I'd say there's a need since there seems to be some confusion from the incongruous subject. Which could be why there's one example given in the thread that's incorrect (I-695/I-83) and the confusion regarding I-76/NJ42 and I-295. Which that one could be unique in that it wasn't on the list in the past (due to the concurrency), is on the list now,  but will not be on list in the future (with no concurrency).   

[TheGrassGuy]

I'd say there's a need since there seems to be some confusion from the incongruous subject. Which could be why there's one example given in the thread that's incorrect (I-695/I-83) and the confusion regarding I-76/NJ42 and I-295. Which that one could be unique in that it wasn't on the list in the past (due to the concurrency), is on the list now,  but will not be on list in the future (with no concurrency).   

How long ago is "the past"? All of the GSV images of that location I have been able to find show a barrier.

[kphoger]

Replace the concrete barrier with a wide paved neutral space–or even just a fat white line–and you would indeed have a true concurrency running on separate lanes.  I find it hard to believe we can't come up with an example somewhere in the world.

[cbeach40]

Replace the concrete barrier with a wide paved neutral space–or even just a fat white line–and you would indeed have a true concurrency running on separate lanes.  I find it hard to believe we can't come up with an example somewhere in the world.

What advantage would there be to designate a road as like, "left lanes are route A, right lanes are route B" instead of just "all lanes are route a/b" ?

[vdeane]

Replace the concrete barrier with a wide paved neutral space–or even just a fat white line–and you would indeed have a true concurrency running on separate lanes.  I find it hard to believe we can't come up with an example somewhere in the world.

Or even just regular striped lanes situated in such a way that through traffic for each road is separate.  The northbound I-87/NY 7 overlap does this; two lanes for NY 7 enter at exit 6, stay as auxiliary lanes for a short distance, and then leave at exit 7.  At no point does thru traffic for either road have to interact with thru traffic from the other; only traffic switching routes has to merge.  The two groups of lane are separated by the thick dotted line normally used for denoting exit/entrance lanes throughout.

Similar story for I-90/I-87, though there is an intermediate exit ramp eastbound/northbound, and the toll barrier complicates things here.

[kphoger]

Replace the concrete barrier with a wide paved neutral space–or even just a fat white line–and you would indeed have a true concurrency running on separate lanes.  I find it hard to believe we can't come up with an example somewhere in the world.

Or even just regular striped lanes situated in such a way that through traffic for each road is separate.  The northbound I-87/NY 7 overlap does this; two lanes for NY 7 enter at exit 6, stay as auxiliary lanes for a short distance, and then leave at exit 7.  At no point does thru traffic for either road have to interact with thru traffic from the other; only traffic switching routes has to merge.  The two groups of lane are separated by the thick dotted line normally used for denoting exit/entrance lanes throughout.

That's a decent example.  I was imagining a big, thick, solid white line;  but the dotted line is similar.


(What's up with the H&R Block bubble?)

What advantage would there be to designate a road as like, "left lanes are route A, right lanes are route B" instead of just "all lanes are route a/b" ?

Well, as shown above, traffic might already be channelized in that way.  Why build an expensive barrier, if some pavement stripes will basically do the same thing.  In the example above, of course, interchanging between "halves" of the highway are possible–but the theoretical separation does exist.  The three left lanes start out as I-87 and then, at the next exit, continue on as I-87.  The two right lanes start out as NY-7 and then, at the next exit, continue on as NY-7.

[jeffandnicole]

I'd say there's a need since there seems to be some confusion from the incongruous subject. Which could be why there's one example given in the thread that's incorrect (I-695/I-83) and the confusion regarding I-76/NJ42 and I-295. Which that one could be unique in that it wasn't on the list in the past (due to the concurrency), is on the list now,  but will not be on list in the future (with no concurrency).   

How long ago is "the past"? All of the GSV images of that location I have been able to find show a barrier.

Somewhere around Dec., 2013.

Now, there's a little trickery involved here.  This GSV should show it fairly clearly:  https://goo.gl/maps/mH1Zo3rAwPUJu2bMA .  There's always been a barrier in the general area.  However, previously, it separated the I-76 Express Lanes from the I-76 Local Lanes and I-295.  Eventually they did away with the Express/Local lane division, and combined those lanes, but then separated I-295's carriageway from I-76.  So prior to December, 2013, you'll see the old setup, and after that date you'll see the current setup.

I-76/NJ42 and I-295 in NJ.

These haven't been concurrent since the barriers went up between them years ago.

Hence the reason it was posted in this thread.

Highway concurrencies that run on separate lanes

Then it's not a concurrency.  Since that requires that they be on the same roadway. 
https://en.wikipedia.org/wiki/Concurrency_(road)

A concurrency in a road network is an instance of one physical roadway bearing two or more different route numbers.

These instead are braided or inner/outer highways. But the route numbers do not share a roadway so they are not a concurrency.

This thread subject is an oxymoron. It's asking for something which can't occur.

My interpretation is that it is effectively asking for two highways that do not form a concurrency but do share the same ROW.

Which is why there's a bit of confusion here.  They definitely are on the same ROW.

[1995hoo]

The I-83/I-695 scenario mentioned further up the thread (as quoted below) seems very similar to the example vdeane and kphoger are discussing. The short skip lines denoting an exit extend the full distance between the concurrency's endpoints (roughly a mile).

I-83 and I-695 fits this description. While I-695 uses the inner mainline, I-83 goes on the outer lanes, and both ends are exit only.

[StogieGuy7]

Interstates 88 and 355 near Downers Grove, IL share the same ROW and are intertwined (but separate) for close to a mile before going their separate ways.

[kphoger]

The I-83/I-695 scenario mentioned further up the thread (as quoted below) seems very similar to the example vdeane and kphoger are discussing. The short skip lines denoting an exit extend the full distance between the concurrency's endpoints (roughly a mile).

I-83 and I-695 fits this description. While I-695 uses the inner mainline, I-83 goes on the outer lanes, and both ends are exit only.

Yep.  Check it out.

[TheStranger]

Would Route 84 east and I-680 north in Sunol count?

https://www.google.com/maps/place/Sunol,+CA/@37.5900716,-121.8730277,1028m/data=!3m1!1e3!4m5!3m4!1s0x808fc23398d75b01:0x4494cb0395e64a97!8m2!3d37.5940369!4d-121.8884812

Route 84 east uses an auxiliary lane along 680 for about a half mile between Paloma Way and Vallecitos Road.  (Route 84 west stays on its own right of way and never actually runs on 680)

[kphoger]

Would Route 84 east and I-680 north in Sunol count?

https://www.google.com/maps/place/Sunol,+CA/@37.5900716,-121.8730277,1028m/data=!3m1!1e3!4m5!3m4!1s0x808fc23398d75b01:0x4494cb0395e64a97!8m2!3d37.5940369!4d-121.8884812

Route 84 east uses an auxiliary lane along 680 for about a half mile between Paloma Way and Vallecitos Road.  (Route 84 west stays on its own right of way and never actually runs on 680)

That might qualify for the original intent of the thread.  That interchange kind of reminds me of Hillsboro, TX, but without the number continuity.

[TheGrassGuy]

Would Route 84 east and I-680 north in Sunol count?

https://www.google.com/maps/place/Sunol,+CA/@37.5900716,-121.8730277,1028m/data=!3m1!1e3!4m5!3m4!1s0x808fc23398d75b01:0x4494cb0395e64a97!8m2!3d37.5940369!4d-121.8884812

Route 84 east uses an auxiliary lane along 680 for about a half mile between Paloma Way and Vallecitos Road.  (Route 84 west stays on its own right of way and never actually runs on 680)

I looked it up on GSV and saw a bit of construction on the right-hand side. Is that just an extra-wide cordoned-off shoulder, or a totally separate lane?

[1995hoo]

I wonder whether the brief stretch of Business US-70 that runs adjacent to I-85 just west of Durham, NC, fits the intent of this thread. The only thing separating Business US-70 (which is a two-lane road with two-way traffic) from the northbound lanes of I-85 is a jersey wall.

Satellite image: https://www.google.com/maps/@36.0307068,-78.9610694,624m/data=!3m1!1e3

Street View: https://goo.gl/maps/7uKQhjRMzmkwQu9b6

[Hwy 61 Revisited]

I-81 runs within I-690 in Syracuse.

[TheGrassGuy]

Are the lower and upper levels on I-10 in San Antonio (https://www.google.com/maps/@29.4571543,-98.5156892,3a,75y,168.75h,88.07t/data=!3m6!1e1!3m4!1sDCyVC_x-NDHPSLIxEG3sMg!2e0!7i16384!8i8192) considered the same or separate highways?

[TheStranger]

Would Route 84 east and I-680 north in Sunol count?

https://www.google.com/maps/place/Sunol,+CA/@37.5900716,-121.8730277,1028m/data=!3m1!1e3!4m5!3m4!1s0x808fc23398d75b01:0x4494cb0395e64a97!8m2!3d37.5940369!4d-121.8884812

Route 84 east uses an auxiliary lane along 680 for about a half mile between Paloma Way and Vallecitos Road.  (Route 84 west stays on its own right of way and never actually runs on 680)

I looked it up on GSV and saw a bit of construction on the right-hand side. Is that just an extra-wide cordoned-off shoulder, or a totally separate lane?

Cordoned off shoulder; the lane that extends from the onramp from Paloma Road (the segment of 84 going west to the town of Sunol) north to the offramp from 680 to the Vallecitos Road segment of 84 is one extended auxiliary lane on its own.

[TheGrassGuy]

Would Route 84 east and I-680 north in Sunol count?

https://www.google.com/maps/place/Sunol,+CA/@37.5900716,-121.8730277,1028m/data=!3m1!1e3!4m5!3m4!1s0x808fc23398d75b01:0x4494cb0395e64a97!8m2!3d37.5940369!4d-121.8884812

Route 84 east uses an auxiliary lane along 680 for about a half mile between Paloma Way and Vallecitos Road.  (Route 84 west stays on its own right of way and never actually runs on 680)

I looked it up on GSV and saw a bit of construction on the right-hand side. Is that just an extra-wide cordoned-off shoulder, or a totally separate lane?

Cordoned off shoulder; the lane that extends from the onramp from Paloma Road (the segment of 84 going west to the town of Sunol) north to the offramp from 680 to the Vallecitos Road segment of 84 is one extended auxiliary lane on its own.

Sorry for not clarifying; I was referring to the EB side.