Inverted SPUIs?

[bugo]

https://en.wikipedia.org/wiki/Single-point_urban_interchange#Inverted_SPUI

I call these X interchanges because the ramps form an X. The X interchange has left exits and left entrances for each ramp, and they all meet in the middle to form an at grade intersection. I-244, the Left Exit Expressway, has two. Wikipedia also mentions X interchanges in North Carolina and Illinois. What was the first X/inverted SPUI interchange built in the US? The Tulsa examples in the article were built in 1967.

[Stephane Dumas]

I don't know what was the first but there another one in Philadelphia on I-76 at South Street Exit. http://goo.gl/maps/GylJK

[NE2]

Wacker at Monroe (no longer exists), built ca. 1950 (45 seconds into the video):

I don't know when Monroe became one-way eastbound.

The West Side Elevated Highway in NYC (1930s) had two interchanges like this, but spread out over several blocks.

[tradephoric]

Inverted SPUI... another great progression killing interchange. 

[Mapmikey]

https://en.wikipedia.org/wiki/Single-point_urban_interchange#Inverted_SPUI

I call these X interchanges because the ramps form an X. The X interchange has left exits and left entrances for each ramp, and they all meet in the middle to form an at grade intersection. I-244, the Left Exit Expressway, has two. Wikipedia also mentions X interchanges in North Carolina and Illinois. What was the first X/inverted SPUI interchange built in the US? The Tulsa examples in the article were built in 1967.

The North Carolina example (I-73/74 at NC 42) opened about 1966.

Mapmikey

[Brandon]

Wacker at Monroe (no longer exists), built ca. 1950 (45 seconds into the video):

I don't know when Monroe became one-way eastbound.

Sometime in the 1960s, IIRC.  Also, IIRC, there was one at Wacker and Randolph.  Both are now just one direction, one-way ramps.

[Brandon]

Inverted SPUI... another great progression killing interchange. 

Especially along the expressway itself.  The two along the Eisenhower Expressway (I-290) at Harlem (IL-43) and Austin are the cause of massive backups in during the rush and even off-peak times.  I believe both were built in the 1960s with that section of the Ike.

[NE2]

Inverted SPUI... another great progression killing interchange. 

If an inverted SPUI kills your precious progression, so does every fucking four-way intersection.

[tradephoric]

Inverted SPUI... another great progression killing interchange. 

If an inverted SPUI kills your precious progression, so does every fucking four-way intersection.

Easy big fella.  You don't have to get so worked up over something as mundane as signal progression. 

[NE2]

I'm a dwarf, you insensitive clod.

[Brandon]

I'm a dwarf, you insensitive clod.

OK, midget. 

[Bickendan]

I'm a dwarf, you insensitive clod.

OK, midget. 

Be nice. It's either Gnome or Hobbit if you really want to go there...

[Alex]

The one at US 422 and US 222 Business in Reading, PA dates from 1963 per National Bridges.

[PHLBOS]

I-76/South Street Interchange in Philadelphia

Originally built in the 1950s with the much of the on/off ramps reconstructed within the last decade as part of the South Street Bridge replacement project.

[Brandon]

I-76/South Street Interchange in Philadelphia

Originally built in the 1950s with the much of the on/off ramps reconstructed within the last decade as part of the South Street Bridge replacement project.

The Schuylkill Expressway has got to be one of the most diabolical open-air torture chambers ever designed by man.  Lanes that end and begin at random, with them exiting and entering on both sides - lose a right lane, and gain a left, wash, rinse, and repeat at the next interchange, then reverse it a half-mile later.

[jeffandnicole]

I-76/South Street Interchange in Philadelphia

Originally built in the 1950s with the much of the on/off ramps reconstructed within the last decade as part of the South Street Bridge replacement project.

The Schuylkill Expressway has got to be one of the most diabolical open-air torture chambers ever designed by man.  Lanes that end and begin at random, with them exiting and entering on both sides - lose a right lane, and gain a left, wash, rinse, and repeat at the next interchange, then reverse it a half-mile later.

Normal people weave in and out on the Schuykill at about 14 lane changes per mile, and don't notice the above.   

[Brandon]

I-76/South Street Interchange in Philadelphia

Originally built in the 1950s with the much of the on/off ramps reconstructed within the last decade as part of the South Street Bridge replacement project.

The Schuylkill Expressway has got to be one of the most diabolical open-air torture chambers ever designed by man.  Lanes that end and begin at random, with them exiting and entering on both sides - lose a right lane, and gain a left, wash, rinse, and repeat at the next interchange, then reverse it a half-mile later.

Normal people weave in and out on the Schuykill at about 14 lane changes per mile, and don't notice the above.   

So I noticed it when I drove it once back in September. 

[myosh_tino]

One of the options being considered for improving Lawrence Expressway in Sunnyvale, CA looks to be using inverted SPUIs at major cross streets...

[jakeroot]

One of the options being considered for improving Lawrence Expressway in Sunnyvale, CA looks to be using inverted SPUIs at major cross streets...

I hope that's a joke.

EDIT: Oh good grief, it's real. To quote many others before me, "what is Caltrans smoking?"

[briantroutman]

I suppose nearly all inverted (left enter/exit)diamonds could be considered "inverted SPUIs" . The four ramps will naturally meet at a single point unless the median is incredibly wide.

But do any inverted SPUIs preserve the continuous or semi-continuous right turns allowed by standard SPUIs?

[NE2]

EDIT: Oh good grief, it's real. To quote many others before me, "what is Caltrans smoking?"

What does Caltrans have to do with it?

[jakeroot]

EDIT: Oh good grief, it's real. To quote many others before me, "what is Caltrans smoking?"

What does Caltrans have to do with it?

Uninformed Seattleite is uninformed.

What is Santa Clara County smoking!?

[mapman1071]

Arizona has one:
Loop 101 Agua Fria Freeway HOV +2 <6-9am 4-6pm> (Left) Exit 7A Maryland Avenue.

[myosh_tino]

EDIT: Oh good grief, it's real. To quote many others before me, "what is Caltrans smoking?"

What does Caltrans have to do with it?

Uninformed Seattleite is uninformed.

What is Santa Clara County smoking!?

It kind of makes sense to me.

To build a typical diamond interchange would require the acquisition of a significant amount of land around each proposed interchange, most of which are business parks and retail shopping centers.  The use of the inverted SPUI and the elimination of one of the four travel lanes in each direction would cut down on the amount of additional land needed and thus keep costs down.

[bugo]

I-76/South Street Interchange in Philadelphia

Originally built in the 1950s with the much of the on/off ramps reconstructed within the last decade as part of the South Street Bridge replacement project.

The Schuylkill Expressway has got to be one of the most diabolical open-air torture chambers ever designed by man.  Lanes that end and begin at random, with them exiting and entering on both sides - lose a right lane, and gain a left, wash, rinse, and repeat at the next interchange, then reverse it a half-mile later.

Sounds a lot like I-244.