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Author Topic: Do they build any new SPUIs lately?  (Read 3492 times)

tolbs17

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Do they build any new SPUIs lately?
« on: February 21, 2022, 12:04:49 PM »

This design

https://connect.ncdot.gov/projects/planning/FeasibilityStudiesDocuments/I-5009_Feasibility-Study_0513B_Draft-Report.pdf

Has been altered to this

https://www.ncdot.gov/news/public-meetings/Documents/I-5009_Selected_Alternative_Newsletter.pdf

And I feel like the current SPUI proposed here could get altered to a tight diamond interchange.

https://www.ncdot.gov/projects/us-70-brier-creek/Documents/alternative-2-revised-brier-creek-tw-alexander.pdf

I call this a downside but this is purposely done to speed up the construction as well as the cost savings, that's probably why they are purposely doing that.
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SkyPesos

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Re: Do they build any new SPUIs lately?
« Reply #1 on: February 21, 2022, 01:25:58 PM »

First of all, how would you define "new" in this case? Like after which year?

Scott5114

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Re: Do they build any new SPUIs lately?
« Reply #2 on: February 21, 2022, 03:23:29 PM »

Oklahoma has built several within the last ten years (there's two of them back-to-back at exit 108B and 109 in Norman), though they seem to have just discovered the DDI and that seems to be their latest obsession. It's a new enough obsession that they haven't gotten any actually built, though.
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tolbs17

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Re: Do they build any new SPUIs lately?
« Reply #3 on: February 21, 2022, 03:25:20 PM »

First of all, how would you define "new" in this case? Like after which year?
I'll say after 2010.
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US 89

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Re: Do they build any new SPUIs lately?
« Reply #4 on: February 21, 2022, 04:38:30 PM »

Oklahoma has built several within the last ten years (there's two of them back-to-back at exit 108B and 109 in Norman), though they seem to have just discovered the DDI and that seems to be their latest obsession. It's a new enough obsession that they haven't gotten any actually built, though.

See, Utah was an early discoverer of the DDI, which means they've been at it long enough to realize that DDIs aren't for everywhere and so you don't see a whole lot of them being proposed or built anymore. UDOT built 8 DDIs between 2010 and 2015: one of those is now gone, and only two more have been installed since then (2019 and 2021).

On the other hand, Utah was an early SPUI adopter and decided that they worked quite well. The vast majority of new or upgraded interchanges in the state have been SPUIs since really the early 2000s when a whole bunch of them opened on I-15 in Salt Lake. By my count, UDOT has built 16 of them since 2010 with at least 5 more in the works in the next few years.

SkyPesos

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Re: Do they build any new SPUIs lately?
« Reply #5 on: February 21, 2022, 04:49:48 PM »

First of all, how would you define "new" in this case? Like after which year?
I'll say after 2010.
Know of a few in the St Louis area:

US 40 with US 67, Hampton Ave and Kingshighway Blvd (2010)
MO 141 with both MO 340 and Route AB (2012)
MO 364 with Route K (2014)

After that, MoDOT seemed to jumped on the DDI train now.
« Last Edit: February 21, 2022, 04:53:50 PM by SkyPesos »
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Tom958

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Re: Do they build any new SPUIs lately?
« Reply #6 on: February 21, 2022, 08:35:00 PM »

These are proper answers to the unstated question: Have
DDIs supplanted SPUIs, or merely supplemented them?
 
Oklahoma has built several within the last ten years (there's two of them back-to-back at exit 108B and 109 in Norman), though they seem to have just discovered the DDI and that seems to be their latest obsession. It's a new enough obsession that they haven't gotten any actually built, though.

See, Utah was an early discoverer of the DDI, which means they've been at it long enough to realize that DDIs aren't for everywhere and so you don't see a whole lot of them being proposed or built anymore. UDOT built 8 DDIs between 2010 and 2015: one of those is now gone, and only two more have been installed since then (2019 and 2021).

On the other hand, Utah was an early SPUI adopter and decided that they worked quite well. The vast majority of new or upgraded interchanges in the state have been SPUIs since really the early 2000s when a whole bunch of them opened on I-15 in Salt Lake. By my count, UDOT has built 16 of them since 2010 with at least 5 more in the works in the next few years.

In Georgia, no new SPUIs have been built since DDIs were introduced. On the contrary, the very major interchange of Abernathy Road and GA 400 was changed from the SPUI that'd been planned since the '90s into a DDI. That's despite the apparent fact that money is no object, with the bridges being replaced and the ramps completely rebuilt for either. The obvious conclusion is that the DDI was judged more effective. That's hard for me to believe, but that's just me.

OTOH, there are several recent suburban interchange reconstructions where conventional layouts were maintained rather than going to DDIs.   :hmmm: 
« Last Edit: February 25, 2022, 05:25:33 AM by Tom958 »
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sprjus4

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Re: Do they build any new SPUIs lately?
« Reply #7 on: February 21, 2022, 08:50:35 PM »

US-17 / VA-165 in Chesapeake, VA was completed around 2017.
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Great Lakes Roads

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Re: Do they build any new SPUIs lately?
« Reply #8 on: February 22, 2022, 12:53:22 AM »

In Indiana, only one SPUI interchange is currently under construction (SR 37 at 146th Street in Fishers), and that was supposed to be a roundabout interchange originally.

Within the past 5-10 years, we have built 3 new SPUI interchanges in Indiana (US 31 at Kern Road in South Bend, US 31 at SR 32 in Westfield, and I-465 at Allisonville Road). The new interchanges have been either DDIs or roundabouts, especially more recently.
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Re: Do they build any new SPUIs lately?
« Reply #9 on: February 23, 2022, 03:23:49 PM »

WisDOT has always seemed to be lukewarm on SPUIs as they've passed on several good candidate locations in the last decade going instead with tight diamonds.  This is particularly the case in the Southeast district around Milwaukee where no SPUIs exist (not counting the super old 3/4 left-exit SPUI at I-94 and Mitchell Blvd by the stadium).  All the freeway fix 'em ups in that area since 2005 and el zillcho.
To this date, there are only 3 true SPUIs in the state; two in Madison and one in Eau Claire.  At present, I don't think there are any on the drawing board.

The Diverging Diamond, however, is gaining in use.  After building 3 of them on I-39/90 in Janesville, they are popping up in more places.  There's one in Appleton, some proposed ones in Madison, and even a future one going in over in that recalcitrant Southeastern District.

Someone already chimed in about Utah.  There always seems to be a SPUI under construction somewhere in that state over the last 20 years.  They keep adding them to the Bangarter as that corridor slowly freewayizes, for example.  But I'd expect as much since UDOT has its shit together better than any public roads agency in America, in my humble opinion.
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Mr_Northside

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Re: Do they build any new SPUIs lately?
« Reply #10 on: February 23, 2022, 03:51:45 PM »

Can't vouch for the whole state, but in PA after a few SPUIs (or SPDI's as I've seen PennDOT refer to them as) were constructed when they were the new hotness, I don't think I've heard of any in quite a few years.

On the other hand, there's been a few DDI's opened in the last couple of years with more planned.
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N737ER

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Re: Do they build any new SPUIs lately?
« Reply #11 on: February 24, 2022, 11:58:52 AM »

Virginia: Rte 7 & Battlefield Pkwy (Leesburg). Started construction Fall 2019, Opened late Summer/early Fall 2021.

By comparison, the I-66/US-15 DDI (Haymarket) was opened well before Fall 2019.
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tolbs17

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Re: Do they build any new SPUIs lately?
« Reply #12 on: February 24, 2022, 12:07:19 PM »

If the highway itself bridges over the arterial then it's more common to see those but the MSE walls drive up the cost.
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jdb1234

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Re: Do they build any new SPUIs lately?
« Reply #13 on: February 24, 2022, 02:26:58 PM »

Was in Tuscaloosa to see the new SPUI on I-20/59 @ McFarland Blvd that opened just recently.  Alabama had one other SPUI before this one was built (it is in Huntsville on I-565).
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chrisdiaz

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Re: Do they build any new SPUIs lately?
« Reply #14 on: February 24, 2022, 11:41:41 PM »

South Carolina has two that I know of: one is at I-526 and US-17 North in Mount Pleasant, and the other is at US 17, SC 707, and Farrow Parkway in Socastee/Myrtle Beach.

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Re: Do they build any new SPUIs lately?
« Reply #15 on: February 25, 2022, 12:44:51 AM »

South Carolina has two that I know of: one is at I-526 and US-17 North in Mount Pleasant, and the other is at US 17, SC 707, and Farrow Parkway in Socastee/Myrtle Beach.

There is also one in West Columbia at I-26 Exit 110 (US 378) that my wife drives every day, and in Spartanburg at I-26 Exit 22 (SC 296).  But both of these have been around since either the 90’s or early 00’s, and since then they have started building DDI’s. They have one nearly completed in Fort Mill at I-77 Exit 88 (SC 460) and are about to start turning I-77 Exit 85 (SC 160) into one.  Also I have a feeling that I-77 Exit 22 (Killian Rd) will be the next one, or possibly something along the stretch of I-26 NW of Columbia that they’re currently reconstructing to six lanes.  They’re doing some wacky stuff in that project at Exits 91 and 97 that I need to try to clarify.

As for Tennessee, they built a lot of SPUIs along TN 385 Bill Morris Pkwy in the 90’s, and they have others scattered around Greater Nashville (even the Nashville Superspeedway is served by a SPUI along I-840).  But they also have at least two DDIs in the Knoxville area.  And Johnson City currently has one of each on I-26.

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Re: Do they build any new SPUIs lately?
« Reply #16 on: February 25, 2022, 02:31:21 AM »

South Carolina has two that I know of: one is at I-526 and US-17 North in Mount Pleasant, and the other is at US 17, SC 707, and Farrow Parkway in Socastee/Myrtle Beach.

There's another one in the Myrtle Beach area, the US 501 interchange with Forestbrook Rd/S26-137. And I'm sure this one is newer than the 90s or early 00s.
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Re: Do they build any new SPUIs lately?
« Reply #17 on: February 25, 2022, 08:41:04 PM »

I'd say the SPUI is not a dying art in Florida, at least in the Orlando area. There are a few that were built over the past couple years as part of the I-4 Ultimate project, and several surface intersections in the area have been converted to SPUIs in the last decade or two.
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Re: Do they build any new SPUIs lately?
« Reply #18 on: February 25, 2022, 09:52:34 PM »

Delaware might be getting one on DE 1 at DE 273 to replace a busy diamond interchange as part of a widening project on DE 1 to three lanes each way.
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Re: Do they build any new SPUIs lately?
« Reply #19 on: February 25, 2022, 10:22:33 PM »

I'd say the SPUI is not a dying art in Florida, at least in the Orlando area. There are a few that were built over the past couple years as part of the I-4 Ultimate project, and several surface intersections in the area have been converted to SPUIs in the last decade or two.

Thanks for reminding me: in Murfreesboro, TN, the busiest surface intersection in town, where US 41/70S (NW Broad St) meets US 231 (Memorial Blvd) and TN 96 (Old Fort Pkwy) was converted to a SPUI maybe 10 years ago.  I believe it ranked as the busiest intersection in Tennessee, and it wasn’t uncommon to sit through 4 or 5 traffic light cycles just to get through during rush hour (and I did everything I could to avoid it when I lived there 20 years ago).  Before building this SPUI, they completed upgrades to nearby roads that could be used as alternates, namely Medical Center Pkwy.
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Re: Do they build any new SPUIs lately?
« Reply #20 on: February 25, 2022, 11:13:22 PM »

South Carolina has two that I know of: one is at I-526 and US-17 North in Mount Pleasant, and the other is at US 17, SC 707, and Farrow Parkway in Socastee/Myrtle Beach.

There's another one in the Myrtle Beach area, the US 501 interchange with Forestbrook Rd/S26-137. And I'm sure this one is newer than the 90s or early 00s.

I have no recollection of an at level crossing at this intersection, so I had to go to Google Earth to check. The SPUI at 501 and Forestbrook was constructed in 2003/2004, so technically mid 2000's  :-D

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Re: Do they build any new SPUIs lately?
« Reply #21 on: February 26, 2022, 11:35:33 PM »

Thanks for reminding me: in Murfreesboro, TN, the busiest surface intersection in town, where US 41/70S (NW Broad St) meets US 231 (Memorial Blvd) and TN 96 (Old Fort Pkwy) was converted to a SPUI maybe 10 years ago. 

More like 5 years ago.  Under construction in 2016, I think they finished in 2017.  I remember this location for work-related reasons.
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Re: Do they build any new SPUIs lately?
« Reply #22 on: March 22, 2022, 05:01:58 PM »

Michigan will be getting a new SPUI interchange at Portage Road in Kalamazoo as part of the current rebuilding and widening of I-94 between Portage Road and Sprinkle Road. Other than that one, MDOT is on a diverging diamond train like many other Midwestern states that used to like either SPUI or Parclo interchanges.
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Re: Do they build any new SPUIs lately?
« Reply #23 on: March 22, 2022, 05:29:37 PM »

First of all, how would you define "new" in this case? Like after which year?
I'll say after 2010.

Iowa has opened two new SPUIs in the past decade: IA 100 at Edgewood Road in Cedar Rapids (2016), and IA 58/27 at Viking Road in Cedar Falls (2019).
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Re: Do they build any new SPUIs lately?
« Reply #24 on: March 23, 2022, 04:26:24 AM »

Oklahoma has built several within the last ten years (there's two of them back-to-back at exit 108B and 109 in Norman), though they seem to have just discovered the DDI and that seems to be their latest obsession. It's a new enough obsession that they haven't gotten any actually built, though.

See, Utah was an early discoverer of the DDI, which means they've been at it long enough to realize that DDIs aren't for everywhere and so you don't see a whole lot of them being proposed or built anymore. UDOT built 8 DDIs between 2010 and 2015: one of those is now gone, and only two more have been installed since then (2019 and 2021).

On the other hand, Utah was an early SPUI adopter and decided that they worked quite well. The vast majority of new or upgraded interchanges in the state have been SPUIs since really the early 2000s when a whole bunch of them opened on I-15 in Salt Lake. By my count, UDOT has built 16 of them since 2010 with at least 5 more in the works in the next few years.

And I'd further add that UDOT has aggressively added SPUIs on most of the Bangerter Highway upgrades from at-grade signals to grade separation.  NINE new SPUIs (and counting) built in the post-DDI era.
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