See the concept images
http://www.txdot.gov/inside-txdot/get-involved/about/hearings-meetings/el-paso/110413.html (http://www.txdot.gov/inside-txdot/get-involved/about/hearings-meetings/el-paso/110413.html)
I'm not aware of this type of design anywhere in Texas, although they are used elsewhere. Looking at Google maps, this is currently a conventionally designed interchange.
A DDI with Texas U-turns.
Though the Do Not Enter signs on image 2 don't make scene as they are facing the correct direction of travel.
There's other issues with the signage; in Image #1, there's supplemental signs below the Yield signs indicating vehicles yield to oncoming traffic. If there's oncoming traffic in that spot, it's because that traffic ended up in the wrong travel lanes.
How is this more efficient? It looks needlessly more complex.
Quote from: JREwing78 on October 16, 2013, 01:02:23 AM
There's other issues with the signage; in Image #1, there's supplemental signs below the Yield signs indicating vehicles yield to oncoming traffic. If there's oncoming traffic in that spot, it's because that traffic ended up in the wrong travel lanes.
Why are there yield signs whatsoever at that location?
Quote from: JREwing78 on October 16, 2013, 01:02:23 AMIf there's oncoming traffic in that spot, it's because that traffic ended up in the wrong travel lanes.
"yield to utterly baffled drivers"
Quote from: longhorn on October 16, 2013, 11:09:38 AM
How is this more efficient? It looks needlessly more complex.
The idea is that you eliminate a signal phase this way, and the remaining phases are longer and move traffic more efficiently. Without this arrangement, you would need to have two sets of protected left turn phases, and possibly have to sit through two light cycles to proceed through the interchange.
It's something that would come in handy on Stoughton Rd. (US-51) in Madison at the Beltline (US-12/18).
A DDI is more efficient when turning volumes are significant and relatively little traffic crosses the freeway. It wouldn't work where the predominant surface movement is straight across.
Who put yield signs on a signalized movement?