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Author Topic: New Interchanges  (Read 1524 times)

CoolAngrybirdsrio4

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New Interchanges
« on: January 01, 2022, 08:31:19 PM »

Which type of interchanges are being built as of now or recently (up to a decade ago)?
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tolbs17

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Re: New Interchanges
« Reply #1 on: January 01, 2022, 08:45:20 PM »

Here in North Carolina

Folded diamond

Single-Point-Urban-Interchange

Diverging Diamond

Diamond

Dumbbell (Still under construction but will open soon as part of the I-95 widening project)

Partial cloverleaf with 1 hairpin ramp

Parclo A2



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Great Lakes Roads

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Re: New Interchanges
« Reply #2 on: January 01, 2022, 08:55:55 PM »

Here in Indiana:

Diamond Interchanges
Diverging Diamond Interchange (DDI) (1 new one, 1 under construction)
Single-Point Urban Interchange (SPUI)
Lots of Roundabouts Interchanges
Folded Diamond
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mukade

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Re: New Interchanges
« Reply #3 on: January 01, 2022, 10:28:15 PM »

Expanding a bit on Indiana:

Here in Indiana:

Diamond Interchanges
Diverging Diamond Interchange (DDI) (1 new one, 1 under construction)  5 in total (I-65 and I-69)
Single-Point Urban Interchange (SPUI)    8 in total (I-65, I-70, I-465, US 20, US 31, SR 37)
Lots of Roundabouts Interchanges   Indiana mainly builds the "Dog bone" variety, and I believe there are at least 20-25 now (I-65, I-69, I-265, US 20, US 31 SR 37, SR 49, SR 641, Keystone Pkwy). Also, there is a fairly unique roundabout interchange on I-69
Folded Diamond
----
Parclos   - These were all the rage from 2000 to 2010, but not that many recently. I think a couple of cloverleafs in Fort Wayne will be converted to parclos in the near future


Also, I-465 gets interchanges with flyover ramps for freeways when rebuilds occur
« Last Edit: January 01, 2022, 11:16:39 PM by mukade »
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andrepoiy

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Re: New Interchanges
« Reply #4 on: January 02, 2022, 11:58:26 AM »

Parclos almost exclusively!
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ran4sh

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Re: New Interchanges
« Reply #5 on: January 02, 2022, 12:09:24 PM »

In Georgia most new interchanges of the past decade have been conversion of an existing interchange (usually a diamond or a 5-ramp partial cloverleaf) to a DDI.

Of course, there's the large interchange of I-285 & SR 400 (US 19) under construction, which will be a stack interchange with collector-distributor roadways to connect nearby interchanges in each direction, similar to other Atlanta-area interchanges. Although it won't be a full stack, as one of the loop ramps will remain a loop.
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Tom958

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Re: New Interchanges
« Reply #6 on: January 02, 2022, 12:59:24 PM »

In Georgia most new interchanges of the past decade have been conversion of an existing interchange (usually a diamond or a 5-ramp partial cloverleaf) to a DDI.

Of course, there's the large interchange of I-285 & SR 400 (US 19) under construction, which will be a stack interchange with collector-distributor roadways to connect nearby interchanges in each direction, similar to other Atlanta-area interchanges. Although it won't be a full stack, as one of the loop ramps will remain a loop.

There are new diamond interchanges at Poplar Road and I-85 in Newnan and at GA 324 and I-85 near Buford, plus a dumbbell interchange at Belfast Keller Road and I-95. Those are just the new ones I can think of right off.
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mgk920

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Re: New Interchanges
« Reply #7 on: January 02, 2022, 01:16:52 PM »

DDIs have become popular here in Wisconsin (WisDOT) since the late 2010s.

Mike
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achilles765

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Re: New Interchanges
« Reply #8 on: January 02, 2022, 06:27:24 PM »

From what I have been able to determine here in Texas....it's stacks on stacks on stacks...There are already so many exits on most freeways anyway, and with our frontage road system, a large number of them are slip ramps onto the frontage road, with an onramp either just before or just after the intersection. 

I am seeing quite a few braided ramps used in some places, especially where there is heavy development.

But for the most part, when there is a new interchange, or an interchange is being redone, it is some form of stack...whether its the huge sprawling 5-levels at major freeway-freeway junctions, or just a couple of direct connectors. 
At least in my part of the state, Houston, there are almost 0 cloverleaves...the the only interchanges even really resembling those are at frontage road to cross street intersections...and those are rare...there is one on Memorial Drive...and Beltway 8 has a cloverleaf interchange with Westpark Tollway....San Antonio and Dallas I know have several, though.

But here, most of the new ones are stacks...or they are converting non-stacks in to stacks... like Beltway 8 and 225, Grand Parkway and SH 249; or redoing old ones like IH 69/US 59 at IH 610 or the big rebuild they did near downtown for IH. 69 and IH 45
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JoePCool14

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Re: New Interchanges
« Reply #9 on: January 02, 2022, 07:15:58 PM »

DDIs have become popular here in Wisconsin (WisDOT) since the late 2010s.

Mike

Roundabout interchanges (either dumbbells or dogbones) are also common in new WisDOT interchanges as well.
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Re: New Interchanges
« Reply #10 on: January 03, 2022, 12:29:11 PM »

Nowadays WISDOT basically only builds three types of interchanges: dumbbells, DDI's, and stacks. Or, in the case of the I-39/90, I-43, and WI-81 interchange, a DDI and stack hybrid. I believe that the newest traditional DDI is at I-39/90 and WI-11, which was finished in 2020. The newest stack is the Zoo Interchange, which is one of the best interchanges in the world IMO. Not sure what the newest completed interchange period is (as in, not a revamp of an existing interchange). Maybe somewhere along US-12 near Baraboo.
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Re: New Interchanges
« Reply #11 on: January 03, 2022, 01:56:14 PM »

Nowadays WISDOT basically only builds three types of interchanges: dumbbells, DDI's, and stacks. Or, in the case of the I-39/90, I-43, and WI-81 interchange, a DDI and stack hybrid. I believe that the newest traditional DDI is at I-39/90 and WI-11, which was finished in 2020. The newest stack is the Zoo Interchange, which is one of the best interchanges in the world IMO. Not sure what the newest completed interchange period is (as in, not a revamp of an existing interchange). Maybe somewhere along US-12 near Baraboo.

Huh. I think this is one of the only cases I have seen where one interchange has been turned into two completely separate interchanges built on top of one another. Maybe there should be a thread for that.

Edit to add that Texas 5 level stacks don’t count. I consider the freeway and service roads to be one road.
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