Utah: modified CFI (at grade separation)

[johndoe]

More info and animation here:
http://www.udot.utah.gov/i15southdavis/?page_id=1214

[NE2]

More SPUish than anything.

[cl94]

Really a 1/4 DDI

[triplemultiplex]

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=40.62397,-111.97640&z=17&t=S

[Henry]

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.

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.

[vdeane]

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.

[cl94]

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=40.62397,-111.97640&z=17&t=S

Both of those examples are CFIs

[johndoe]

...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.

[roadfro]

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

[johndoe]

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.

[johndoe]

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.

[jakeroot]

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:

[johndoe]

Here we go: http://www.ishgd2015.net/s/113-Hybrid-Interchange-Designs-Evolving-Something-new-from-Something-Old.pdf