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Author Topic: I-75/I-71 Diverging Diamond Interchanges  (Read 382 times)

iBallasticwolf2

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I-75/I-71 Diverging Diamond Interchanges
« on: June 10, 2018, 10:22:51 PM »

Kentucky awarded $67.5 million to transform Northern Kentucky interchanges
INFRA grant funds safety, mobility improvements in Boone County
From official KYTC news release- https://transportation.ky.gov/NewsRoom/Boone%20Co%20INFRA%20Grant.pdf
Project improvements
 Replacement of the existing conventional diamond I-71/I-75 interchanges at KY 338 (Richwood
Road) and KY 536 (Mt. Zion Road) with double crossover diamond (DCD) interchanges. These
improvements eliminate bottlenecks and improve safety;
 Reconstruction of the intersection of U.S. 25 and KY 338 just east of the I-71/I-75 interchange with
KY 338 to construct a Single Point Urban Interchange (SPUI), eliminating two at-grade rail
crossings;
 Construction of northbound and southbound auxiliary lanes along I-71/I-75 north of the KY 536
interchange (MP 178.039 to MP 180.06); and
 Enhancements including minor widening along KY 536 and KY 338 to accommodate turn lanes,
intersection improvements, access management and non-motorized transportation improvements.
Construction for portions of the project will begin in 2019. The estimated completion for the entire project
is the winter of 2021.
Video showing future I-75/I-71 and KY 536 interchange

Video showing future I-75/I-71 and KY 338 interchange
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Only two things are infinite in this world, stupidity, and I-75 construction

qguy

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Re: I-75/I-71 Diverging Diamond Interchanges
« Reply #1 on: June 12, 2018, 08:40:35 AM »

What's with the goofy name change? Double crossover diamond interchange?
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BrianP

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Re: I-75/I-71 Diverging Diamond Interchanges
« Reply #2 on: June 12, 2018, 10:01:20 AM »

I think it's a much better description of the interchange.  There are two places where the two directions of travel crossover each other.   What's diverging about it anyway?  That seems to be the nonsense description.
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ilpt4u

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Re: I-75/I-71 Diverging Diamond Interchanges
« Reply #3 on: June 12, 2018, 11:01:29 AM »

The video presentation didn't give IL any credit for its DDIs...

There are at least 3 I know of in IL now
I-88 @ IL 59
I-90 @ Elmhurst Rd
I-57 @ The Hill Ave
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hbelkins

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    • Millennium Highway
Re: I-75/I-71 Diverging Diamond Interchanges
« Reply #4 on: June 12, 2018, 02:35:26 PM »

What's with the goofy name change? Double crossover diamond interchange?

That's what Kentucky has always called them, and I agree that it's a more descriptive name than diverging diamond. What diverges from what, and where does it diverge to? It may diverge, but it "re-verges."
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qguy

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Re: I-75/I-71 Diverging Diamond Interchanges
« Reply #5 on: June 13, 2018, 10:05:55 AM »

Oh I agree entirely that double-crossover is much more descriptive. I've always thought that diverging-diamond is typical "engineerspeak" created and used with no regard for public understanding. The alternate name is counter-conventional but there's nothing wrong with that when it's for a good reason and it's effective.

I can easily imagine a group of DOT officials meeting around a table saying, "If we want get a sceptical public on board with this, we'd better rename it or no one will know what in heck we're talking about."
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