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Author Topic: SPUI vs DDI  (Read 12106 times)

jakeroot

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Re: SPUI vs DDI
« Reply #100 on: July 27, 2021, 03:15:44 PM »

And there's another interchange close by. So some traffic uses that one as well. While AADT might not look high enough to warrant signals, you are crossing a wide 6-lane boulevard therefore that's why it's signalized.

What? No one at the interchange you posted is crossing six lanes, apart from the westbound off-ramp. The eastbound on-ramp only crosses three lanes, and there is no inherent need for a signal crossing three lanes unless there is enough oncoming traffic to back up left turning traffic regularly enough to require at least part-time protection. Basically what already exists.

Unless you are referring to the westbound off-ramp. But then I'm not sure why you would since no one is talking about it.
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tradephoric

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Re: SPUI vs DDI
« Reply #101 on: July 27, 2021, 03:16:45 PM »

Here's an unsignalized Parclo B4 along a 6-lane boulevard in Florida.
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tolbs17

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Re: SPUI vs DDI
« Reply #102 on: July 27, 2021, 03:21:03 PM »

Here's an unsignalized Parclo B4 along a 6-lane boulevard in Florida.
talking about if you are exiting the highway.
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kphoger

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Re: SPUI vs DDI
« Reply #103 on: July 27, 2021, 03:39:41 PM »

And there's another interchange close by. So some traffic uses that one as well. While AADT might not look high enough to warrant signals, you are crossing a wide 6-lane boulevard therefore that's why it's signalized.

I don't think any of us (except perhaps you) has suggested the interchange shouldn't have signals.  We've just been talking about the A/B configuration of the ParClo.
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tolbs17

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Re: SPUI vs DDI
« Reply #104 on: July 27, 2021, 03:41:49 PM »

And there's another interchange close by. So some traffic uses that one as well. While AADT might not look high enough to warrant signals, you are crossing a wide 6-lane boulevard therefore that's why it's signalized.

I don't think any of us (except perhaps you) has suggested the interchange shouldn't have signals.  We've just been talking about the A/B configuration of the ParClo.
Now check out the ParClo B4 near Sims. Do you think that interchange is overbuilt?
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kphoger

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Re: SPUI vs DDI
« Reply #105 on: July 27, 2021, 03:45:10 PM »

Now check out the ParClo B4 near Sims. Do you think that interchange is overbuilt?

Are you going to provide a Google Maps link?  Or even a freaking state name?  Because this is the only Sims I'm familiar with.
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tolbs17

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Re: SPUI vs DDI
« Reply #106 on: July 27, 2021, 03:46:45 PM »

Now check out the ParClo B4 near Sims. Do you think that interchange is overbuilt?

Are you going to provide a Google Maps link?  Or even a freaking state name?  Because this is the only Sims I'm familiar with.
6297 US-264 ALT
https://maps.app.goo.gl/wZ9bB9m2CvMZ8Uzc9
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kphoger

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Re: SPUI vs DDI
« Reply #107 on: July 27, 2021, 03:55:38 PM »



Now check out the ParClo B4 near Sims. Do you think that interchange is overbuilt?

Are you going to provide a Google Maps link?  Or even a freaking state name?  Because this is the only Sims I'm familiar with.

6297 US-264 ALT
https://maps.app.goo.gl/wZ9bB9m2CvMZ8Uzc9

Ehhh, maybe not.  The southwestern loop ramp has an AADT of 4400, so it's probably justified.  And the northeastern loop ramp avoids left turns onto US-264-Alt, which has an AADT of 15,500 there.
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Re: SPUI vs DDI
« Reply #108 on: July 27, 2021, 04:01:13 PM »

Now check out the ParClo B4 near Sims. Do you think that interchange is overbuilt?

Are you going to provide a Google Maps link?  Or even a freaking state name?  Because this is the only Sims I'm familiar with.

There's this one too, although it's only a business and not a city.
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jakeroot

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Re: SPUI vs DDI
« Reply #109 on: July 27, 2021, 05:12:02 PM »

Now check out the ParClo B4 near Sims. Do you think that interchange is overbuilt?

Why are you always worried about interchanges being overbuilt? Partial Cloverleafs are literally just cloverleafs with even fewer ramps. Apart from the land they can take (less for partial variations, mind you), cloverleafs are considered very unobtrusive, as they require only a single overpass or underpass, and are only two levels. That interchange near Sims would qualify as overbuilt, IMO, if there were multiple left turn lanes, traffic signals, maybe even a flyover...but what's there now is far from overbuilt.
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tolbs17

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Re: SPUI vs DDI
« Reply #110 on: December 18, 2021, 02:58:00 PM »

Now check out the ParClo B4 near Sims. Do you think that interchange is overbuilt?

Why are you always worried about interchanges being overbuilt? Partial Cloverleafs are literally just cloverleafs with even fewer ramps. Apart from the land they can take (less for partial variations, mind you), cloverleafs are considered very unobtrusive, as they require only a single overpass or underpass, and are only two levels. That interchange near Sims would qualify as overbuilt, IMO, if there were multiple left turn lanes, traffic signals, maybe even a flyover...but what's there now is far from overbuilt.
Because they just pay more for nothing. But back from 1999-2003 most to all traffic had to exit there to get on US-264 East since the Wilson bypass was done in two phases. The southbound ramps were signalized as well.
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jakeroot

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Re: SPUI vs DDI
« Reply #111 on: December 18, 2021, 06:28:57 PM »

Because they just pay more for nothing.

I feel like this is a rather gross generalization. I think what you're seeing in NC is simply preparation for expected growth, particularly in regards to the partial cloverleafs which are a great way to preserve right of way without overspending (they are relatively cheap as they don't have flyovers).
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tolbs17

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Re: SPUI vs DDI
« Reply #112 on: December 24, 2021, 06:37:39 PM »

Are there any websites for a SPUI interchange like there is with a DDI interchange and a roundabout interchange like here?

https://roundabouts.kittelson.com/
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US 89

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Re: SPUI vs DDI
« Reply #113 on: January 04, 2022, 12:59:20 PM »

Are there any websites for a SPUI interchange like there is with a DDI interchange and a roundabout interchange like here?

https://roundabouts.kittelson.com/

Somebody can post one and prove me wrong, but I feel like they are too common for that. Utah alone currently has 38 SPUIs with at least five more in various stages of construction/planning.

I realize that site has a roundabouts database and those are way more common than even SPUIs, but there are so many that a dataset like that will quickly become inaccurate and out of date.
« Last Edit: January 04, 2022, 01:02:35 PM by US 89 »
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tolbs17

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Re: SPUI vs DDI
« Reply #114 on: January 04, 2022, 01:05:53 PM »

Are there any websites for a SPUI interchange like there is with a DDI interchange and a roundabout interchange like here?

https://roundabouts.kittelson.com/

Somebody can post one and prove me wrong, but I feel like they are too common for that. Utah alone currently has 38 SPUIs with at least five more in various stages of construction/planning.
Ah. Well we have like 10-15 or so here. We still build them it just depends on the circumstances of where one would fit the best.

A SPUI is currently planned here, and another one herewhich came from the NC 11/NC 58 relocation but that was from a feasibility study so it might never happen.

https://connect.ncdot.gov/projects/planning/Pages/FeasibilityStudyDocuments.aspx#InplviewHash956c0103-f47f-4f71-9192-dec1d2976da5=SortField%3DYear-SortDir%3DDesc-FilterField1%3DCounty-FilterValue1%3DLenoir

Skip to pages 22 and 26 for more details.
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tradephoric

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Re: SPUI vs DDI
« Reply #115 on: January 04, 2022, 02:37:34 PM »

Are there any websites for a SPUI interchange like there is with a DDI interchange and a roundabout interchange like here?

https://roundabouts.kittelson.com/

While by no means complete, here is a KMZ file of roughly 160 USA SPUIs:
https://www.mediafire.com/file/frrld5uhdwr2klp/SPUI.kmz/file
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tolbs17

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Re: SPUI vs DDI
« Reply #116 on: January 04, 2022, 03:28:02 PM »

Are there any websites for a SPUI interchange like there is with a DDI interchange and a roundabout interchange like here?

https://roundabouts.kittelson.com/

While by no means complete, here is a KMZ file of roughly 160 USA SPUIs:
https://www.mediafire.com/file/frrld5uhdwr2klp/SPUI.kmz/file
Definitely misses a lot of them after looking at it.
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