(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fwww.roadsbridges.com%2Fsites%2Frb%2Ffiles%2Fimce-images%2FPhoto2.jpg&hash=d1b3305b08cca676ab2cb7e5ed94b4e4d4ff0c13)
More info and animation here:
http://www.udot.utah.gov/i15southdavis/?page_id=1214
More SPUish than anything.
Really a 1/4 DDI
It's more reminiscent of the types of intersections Utah has on the Bangerter Highway in suburban SLC where left turning traffic crosses the opposite lane of traffic ahead of the intersection and then meets the cross street.
examples:
http://mapper.acme.com/?ll=40.50817,-111.98249&z=18&t=S (http://mapper.acme.com/?ll=40.50817,-111.98249&z=18&t=S)
http://mapper.acme.com/?ll=40.62397,-111.97640&z=17&t=S (http://mapper.acme.com/?ll=40.62397,-111.97640&z=17&t=S)
Quote from: NE2 on October 28, 2015, 11:16:40 PM
More SPUish than anything.
I have to disagree on that assessment, since the ramps themselves do not come to the same location. In fact, there's one ramp that leads to a different street altogether.
Quote from: cl94 on October 28, 2015, 11:58:44 PM
Really a 1/4 DDI
Only the left turn lanes on the crossover to southbound I-15 move to the opposite side of the road. Other than that, it looks like a normal interchange.
Quote from: Henry on October 29, 2015, 01:27:04 PM
Quote from: cl94 on October 28, 2015, 11:58:44 PM
Really a 1/4 DDI
Only the left turn lanes on the crossover to southbound I-15 move to the opposite side of the road. Other than that, it looks like a normal interchange.
That's why he called it a 1/4 DDI. One of the four movements that would cross over in a DDI crosses over here.
Quote from: triplemultiplex on October 29, 2015, 11:28:38 AM
It's more reminiscent of the types of intersections Utah has on the Bangerter Highway in suburban SLC where left turning traffic crosses the opposite lane of traffic ahead of the intersection and then meets the cross street.
examples:
http://mapper.acme.com/?ll=40.50817,-111.98249&z=18&t=S (http://mapper.acme.com/?ll=40.50817,-111.98249&z=18&t=S)
http://mapper.acme.com/?ll=40.62397,-111.97640&z=17&t=S (http://mapper.acme.com/?ll=40.62397,-111.97640&z=17&t=S)
Both of those examples are CFIs
...what's in a name...who cares?
It's interesting that the DCD has gotten so popular, partially because of 2-phase signals, like CFI, yet the east ramp here has 4 phases. Instead of making the traditional 3-phase simplified, this is more complicated.
Quote from: johndoe on October 29, 2015, 09:17:48 PM
It's interesting that the DCD has gotten so popular, partially because of 2-phase signals, like CFI, yet the east ramp here has 4 phases. Instead of making the traditional 3-phase simplified, this is more complicated.
Unless I'm missing something, the eastern ramp intersection (I-15 north) can run three phases:
1) EB & WB thru
2) EB left & WB left crossover (NB off ramp right turn can overlap)
3) NB off ramp
Quote from: roadfro on October 30, 2015, 01:10:45 AM
Quote from: johndoe on October 29, 2015, 09:17:48 PM
It's interesting that the DCD has gotten so popular, partially because of 2-phase signals, like CFI, yet the east ramp here has 4 phases. Instead of making the traditional 3-phase simplified, this is more complicated.
Unless I'm missing something, the eastern ramp intersection (I-15 north) can run three phases:
1) EB & WB thru
2) EB left & WB left crossover (NB off ramp right turn can overlap)
3) NB off ramp
Good point...I'm not sure what I was thinking. Maybe this is why the person mentioned the similarity to a spui, since the same movements exist (except there is only one ramp and one left is likely permissive) It'd be cool to see their ring and barrier setup.
I'll post this here instead of starting a new thread since it's related: http://www.heraldtribune.com/article/20151026/ARTICLE/151029729
It's a variation being considered in Florida.
Quote from: johndoe on November 03, 2015, 06:25:13 PM
I'll post this here instead of starting a new thread since it's related: http://www.heraldtribune.com/article/20151026/ARTICLE/151029729
It's a variation being considered in Florida.
I really need a higher res screenshot than this. I can't figure out what the hell is going on, short of some obvious Utah-inspired lefts turns:
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fwww.heraldtribune.com%2Fapps%2Fpbcsi.dll%2Fbilde%3FSite%3DSH%26amp%3BDate%3D20151026%26amp%3BCategory%3DARTICLE%26amp%3BArtNo%3D151029729%26amp%3BRef%3DAR%26amp%3BimageVersion%3DMain%26amp%3BMaxW%3D728%26amp%3Blogo%3D%2Fimages%2Fwatermark.gif%26amp%3Blogoxpos%3D0%26amp%3Blogoypos%3D0&hash=fa107b94377e03340f51c543c3fb29417a11ab3d)
Here we go: http://www.ishgd2015.net/s/113-Hybrid-Interchange-Designs-Evolving-Something-new-from-Something-Old.pdf