Interchanges between Conventional Roads

[mapman1071]

44th Street (Decertified  AZ 153) & Sky Harbor Blvd (Unsigned AZ Loop 202 Spur) Phoenix
42nd Street/43rd Street & Sky Harbor Blvd (Unsigned AZ Loop 202 Spur) Phoenix

[NE2]

44th Street (Decertified  AZ 153) & Sky Harbor Blvd (Unsigned AZ Loop 202 Spur) Phoenix
42nd Street/43rd Street & Sky Harbor Blvd (Unsigned AZ Loop 202 Spur) Phoenix

Conventional roads my ass.

[okroads]

TX 115 & FM 1178:

http://maps.google.com/?ll=32.384347,-102.418864&spn=0.010347,0.021136&t=k&z=16

[deathtopumpkins]

It's a SPUI if left turns can be set to go simultaneously. Straight movements have nothing to do with it.

https://maps.google.com/?ll=36.855441,-76.209475&spn=0.001651,0.001737&t=k&deg=270&z=20&layer=c&cbll=36.855353,-76.209537&panoid=n7NZpnO8yjIOpr23jYp_sQ&cbp=12,303.27,,2,-1.49
Looks like one to me.

But they aren't. Like I said in my previous post, the signals do not appear to be timed like that. They are timed with straight+left in one direction, then the other. I'm only guessing this from aerial imagery, since it's been years since I've driven there, but you can see cars going straight and turning at the same time in the imagery.

Maybe it can be set up that way, since it seems the markings and signs allow it, but you can see right there in the imagery that it is not functioning as a traditional SPUI, which is why I still say it isn't one.
I'd consider it a hybrid, but not a true SPUI.

[NE2]

It's a SPUI that doesn't walk the walk.

[vtk]

Why can't a SPUI operate with split phasing some of the time?

[D-Dey65]

Unless I missed it, I can't believe nobody has mentioned Park Avenue and 42nd Street in Manhattan near Grand Central Terminal. Unfortunately, the northbound off-ramp has been closed and is only used for bicycles now.

[Avalanchez71]

US 31 (SR 6) at the General Motors Spring Hill Assembly south gate.  There is an interchange there.

[froggie]

Maybe it can be set up that way, since it seems the markings and signs allow it, but you can see right there in the imagery that it is not functioning as a traditional SPUI, which is why I still say it isn't one.

It's functioning as a single intersection, instead of two.  By definition, that's a SPUI.

The ramps may have split-phase timing, but US 58 doesn't.  Both lefts at the same time on 58.

[kphoger]

Maybe it can be set up that way, since it seems the markings and signs allow it, but you can see right there in the imagery that it is not functioning as a traditional SPUI, which is why I still say it isn't one.

It's functioning as a single intersection, instead of two.  By definition, that's a SPUI.

The ramps may have split-phase timing, but US 58 doesn't.  Both lefts at the same time on 58.

Functioning as a single intersection is not the only thing that makes a SPUI a SPUI.

The original SPUI, at US-19 & FL-60 in Clearwater, does not have through movements on the surface-level road.  I would consider the design of that interchange to be the definition of what a SPUI is.  Adding through movements for the surface-level road changes things.  You might call it a Modified SPUI, but don't call it a SPUI.

Is three-phase signalling even possible with those additional movements?  I'm no expert, but the only way I can see making a SPUI that's been modified in that way function as a single intersection is to add a fourth signal phase.

[NE2]

The original SPUI, at US-19 & FL-60 in Clearwater, does not have through movements on the surface-level road.

Beach at Lancaster in Fort Worth was earlier (1962 per NBI; 1963 aerial). But it's been suppressed by the Obamabots.

I would consider the design of that interchange to be the definition of what a SPUI is.  Adding through movements for the surface-level road changes things.  You might call it a Modified SPUI, but don't call it a SPUI.

http://www.fhwa.dot.gov/publications/research/safety/09060/009.cfm#sec9_2

Additionally, if frontage roads are present, a SPUI may need an additional phase to serve through movements on the ramp.

http://pubsindex.trb.org/view/1991/m/364853 includes frontage SPUIs.

[Kacie Jane]

Seattle, WA:
15th Ave NW & NW Leary Way http://goo.gl/maps/A8i0X
15th Ave W & W Nickerson St http://goo.gl/maps/TU0c0
15th Ave W & W Dravus St http://goo.gl/maps/MnrgE

It may be a borderline case with three interchanges in such a short span, but I think you'd be hard pressed to consider 15th any sort of expressway.  It's not divided through one and a half of the interchanges, and there's no restriction of access between the southern two interchanges.  (Nor would there be between the northern interchanges, but since it's going over a bridge, there's no adjacent property.)  Also note how the streets a block or two north and south of Leary intersect the ramps to/from 15th.

[kphoger]

FHWA link

I stand corrected.

Beach at Lancaster in Fort Worth

Was that stoplight-controlled?

[NE2]

Beach at Lancaster in Fort Worth

Was that stoplight-controlled?

No idea. I think I see a stop line westbound in the 1970 aerial, and the two cars waiting on the northbound offramp may imply a red light.

[TheStranger]

One in Greensboro I missed, West Cone Boulevard and Lawndale Drive:

https://maps.google.com/maps?q=W+Cone+Blvd,+Greensboro,+NC&hl=en&ll=36.108813,-79.819767&spn=0.004934,0.004163&sll=36.103053,-79.818485&sspn=0.013956,0.016651&oq=w+cone+blvd,&t=h&hnear=W+Cone+Blvd,+Greensboro,+Guilford,+North+Carolina+27408&z=18

[TheStranger]

US 59 at US 40 in Lawrence, Kansas:

https://maps.google.com/maps?q=w+6th+st+%26+Iowa+St,+lawrence,+ks&hl=en&ll=38.972856,-95.260724&spn=0.006765,0.009495&sll=38.973048,-95.260574&sspn=0.006765,0.009495&t=h&hnear=W+6th+St+%26+Iowa+St,+Lawrence,+Douglas,+Kansas+66044&z=17

[hbelkins]

US 59 at US 40 in Lawrence, Kansas:

https://maps.google.com/maps?q=w+6th+st+%26+Iowa+St,+lawrence,+ks&hl=en&ll=38.972856,-95.260724&spn=0.006765,0.009495&sll=38.973048,-95.260574&sspn=0.006765,0.009495&t=h&hnear=W+6th+St+%26+Iowa+St,+Lawrence,+Douglas,+Kansas+66044&z=17

All movements between US 40 and US 59 are done at the surface level.

[english si]

All movements between US 40 and US 59 are done at the surface level.

He meant McDonald Drive at US40 and US59...

[vtk]

I'd count that as an "interchange", yes, but close to not.  On the other hand, McDonald Drive is on the border of being an expressway, so this might not fit the "conventional roads" criterion of the thread.

I suppose since this example is borderline by two different criteria, that would literally make it a "corner case".

[TheStranger]

PA 36 at Plank Road, Holidaysburg:

https://maps.google.com/maps?q=Hollidaysburg,+PA&hl=en&ll=40.424784,-78.388503&spn=0.009703,0.013797&sll=27.698638,-83.804601&sspn=6.319638,9.140625&oq=Holidaysburg,+PA&t=h&hnear=Hollidaysburg,+Blair,+Pennsylvania&z=16

[PHLBOS]

In Boston (Roslindale section); MA 203 (Morton St.) & American Legion Highway

http://goo.gl/maps/uqSxs

[roadman65]

Julesburg, CO- US 138 and  US 385.

[djlynch]

TX 176 at TX 349 in the middle of nowhere east of Andrews. One of several places I can think of where TxDOT has put an interchange at the intersection of two roads which are relatively long, straight, flat, and high-speed, presumably to reduce the number of potential conflicts.
https://maps.google.com/?ll=32.320036,-102.170792&spn=0.007988,0.016512&t=h&z=17

It's long gone now, but the time the Ben White (US 290/TX 71)-Lamar-Loop 360 cloverleaf in Austin was replaced in the early 90s was three surface streets and one road (360) that was designed as an expressway but had so many traffic lights that it moved more like a surface street.

[TheStranger]

Keith Avenue at Broening Highway, Dundalk, MD:

https://maps.google.com/maps?q=Broening+Highway+%26+Keith+Avenue,+Dundalk,+MD&hl=en&ll=39.264914,-76.543025&spn=0.006994,0.009634&sll=39.264158,-76.54178&sspn=0.006994,0.009634&t=h&hnear=Broening+Hwy+%26+Keith+Ave,+Baltimore,+Maryland+21224&z=17&layer=t

[Alex4897]

DE 273 and DE 4 in Newark; US 40/13 and DE 141/US 202 in New Castle.