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Started By
Message
Did DOTD consider a Diverging Diamond Intersection for I10/Highland?
Posted on 8/8/17 at 10:00 am
Posted on 8/8/17 at 10:00 am
TD User, Pettifogger mentioned a diverging diamond interchange in the Traffic Circle thread. I have never heard of them nor had I driven through one.
After looking at the animations, could this have been a solution for the I10/Highland interchange? Maybe even College Dr?
I'm gonna assume the DOTD looked into the DD design but concluded it would be too difficult to build over an existing highly trafficked intersection.
I know the Pecue interchange is supposed to take some of the pressure off the Highland interchange but I'm somewhat skeptical this will only be a temp fix as the population of Ascension will still use the Highland exit.
Are there any DD intersections in LA today?
After looking at the animations, could this have been a solution for the I10/Highland interchange? Maybe even College Dr?
I'm gonna assume the DOTD looked into the DD design but concluded it would be too difficult to build over an existing highly trafficked intersection.
I know the Pecue interchange is supposed to take some of the pressure off the Highland interchange but I'm somewhat skeptical this will only be a temp fix as the population of Ascension will still use the Highland exit.
Are there any DD intersections in LA today?
This post was edited on 8/8/17 at 10:01 am
12
Posted on 8/8/17 at 10:02 am to Tigeralum2008
LADOTD....implementing something actually useful? Come on man...you know better than that.
Posted on 8/8/17 at 10:03 am to Tigeralum2008
What manner of sorcery is this?
Posted on 8/8/17 at 10:06 am to Tigeralum2008
I'd love to see the madness that would ensue if a double roundabout was implemented.
Posted on 8/8/17 at 10:06 am to Jim Rockford
quote:
What manner of sorcery is this?
It's pretty crazy but there seems to be a lot of positive benefits to that type of intersection.
Posted on 8/8/17 at 10:07 am to Jackie Chan
quote:
I'd love to see the madness that would ensue if a double roundabout was implemented.
They've proposed this at the I10/Tanger exit in Ascension.
it got voted down in a tax election a few years ago.
Posted on 8/8/17 at 10:08 am to Tigeralum2008
Pretty interesting concept, but I'm not sure how much it would reduce congestion during peak times.
Posted on 8/8/17 at 10:11 am to Jackie Chan
quote:
I'd love to see the madness that would ensue if a double roundabout was implemented.
That exists at I-12 and 51 in Hammond. There's actually a 3rd roundabout a little further down on the south side. It works pretty great.
Posted on 8/8/17 at 10:12 am to Jackie Chan
There's already one in Hammond at the I-12/US 51 exit. There's a third roundabout just south of the exit for good measure.
PhiTiger1764 beat me to it
PhiTiger1764 beat me to it
This post was edited on 8/8/17 at 10:13 am
Posted on 8/8/17 at 10:12 am to PhiTiger1764
wasn't the walker exit on I-12 going to be a double roundabout?
Posted on 8/8/17 at 10:12 am to Tigeralum2008
Using that first pic and assuming it's the Highland exit facing NW, I would say that it still presents a problem. The exit that is always so backed up is still restricted by the light once you pass under the overpass.
Posted on 8/8/17 at 10:13 am to Tigeralum2008
That's an insurance seminar waiting to happen.
Posted on 8/8/17 at 10:13 am to PhiTiger1764
I use a double roundabout twice a day, and it works great. I think it's cut congestion, although the official reasoning for it is to reduce the severity of accidents.
Posted on 8/8/17 at 10:13 am to Tigeralum2008
This is one of the most efficient interchange designs I've seen. I don't know the name of it, but here is the picture of the McEwen interchange in Franklin, TN.
Minimum red lights and great flow on and off the interstate.
Minimum red lights and great flow on and off the interstate.
Posted on 8/8/17 at 10:14 am to LNCHBOX
quote:
Pretty interesting concept, but I'm not sure how much it would reduce congestion during peak times.
What compounds the problem at Highland I-10 is Perkins Road connecting to Highland so close to I-10 on each side of I-10.
You actually have three main arteries intersecting at one place.
A similar but not as congested situation exists where Jefferson Hwy, Siegen/Sherwood and Airline Highway intersect.
Posted on 8/8/17 at 10:15 am to Jackie Chan
As others have noted, Hammond got a dbl roundabout at i12/hwy51.
There was quite a bit of insanity while ppl tried to figure out wtf
There was quite a bit of insanity while ppl tried to figure out wtf
Posted on 8/8/17 at 10:15 am to Tigeralum2008
I've been saying for several years a major, and feasible, improvement would be to focus on 73.
73(or 73/621) should be continuous via flyovers from 10 to 61 and removing stop lights(overpass at duplessis and service roads for example).
Natchez MS has a damned flyover from 61/bus 61 and has 1/2 the population of Pville alone.
Think about that.
So on topic OP, if Drivers on 10 could get to 61 without stopping at 73, the improvement at 10/Highland and obviously 73 would be indisputably worth the $$.
Here's Podunk arse Natchez with a continuous flyover at 61/bus61 north of town. smh at this b/c they absolutely didn't need that shite.
73(or 73/621) should be continuous via flyovers from 10 to 61 and removing stop lights(overpass at duplessis and service roads for example).
Natchez MS has a damned flyover from 61/bus 61 and has 1/2 the population of Pville alone.
Think about that.
So on topic OP, if Drivers on 10 could get to 61 without stopping at 73, the improvement at 10/Highland and obviously 73 would be indisputably worth the $$.
Here's Podunk arse Natchez with a continuous flyover at 61/bus61 north of town. smh at this b/c they absolutely didn't need that shite.
This post was edited on 8/8/17 at 10:44 am
Posted on 8/8/17 at 10:18 am to AnonymousTiger
Found the name. It's called a Single Point Urban Interchange (SPIU).
The diverging diamond seems to eliminate the problem of left turning vehicles waiting through two lights, but it still makes ongoing traffic sit through two of them.
quote:
Recognizing the need to minimize right-of-way impacts while efficiently handling the anticipated high traffic volumes, the City of Franklin engaged GS&P to develop a distinct and effective design that conserves valuable commercial property. The engineering design team, headed by principal-in-charge Michael Flatt, P.E., recommended a Single-Point Urban Interchange (SPUI) design. This design allows for increased traffic capacity and reduced delays by eliminating a step in maneuvering through the freeway interchange.
In the SPUI design, all traffic movements are initiated at one large intersection controlled by one traffic signal. When the traffic signal turns green, opposing traffic moves quickly through the intersection. This is more efficient than traditional diamond interchange design which contains signals at the end of both exit ramps causing left-turning vehicles to often wait at two traffic signals.
The diverging diamond seems to eliminate the problem of left turning vehicles waiting through two lights, but it still makes ongoing traffic sit through two of them.
Posted on 8/8/17 at 10:19 am to mikelbr
What happens when the power goes out? You've never seen a cluster frick so bad when all those lights start flashing and both directions of traffic use one side of the highway.
Posted on 8/8/17 at 10:20 am to link
Not sure.. only other one I had heard about was Gonzales.
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