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Old May 8th, 2015, 03:28 AM   #2901
Tom 958
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Quote:
Originally Posted by ChrisZwolle View Post
A very unusual diverging diamond interchange is planned in Lee's Summit, Missouri. It will involve a roundabout on one side. It's at the US 50 / Route 291 interchange.

http://i.imgur.com/U8uTyDA.jpg
I want one in my city. Maybe they could name it after my mother, who hates both DDI's and roundabouts (and, thankfully, doesn't drive).

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Old May 9th, 2015, 11:02 PM   #2902
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Roundabouts are very useful in a lot of situations, USA should have them along the country (cuyrrent number is ridiculously small). I think that Carmel, IN is the USA city with more roundabouts, are they working fine?.
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Old May 14th, 2015, 08:08 AM   #2903
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Future plans of Loop 49 in Tyler, TX
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Old May 15th, 2015, 02:19 AM   #2904
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Madison Avenue Bridge across the Harlem River between Manhattan & The Bronx


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by Corey Best, on Flickr
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Old May 18th, 2015, 09:35 PM   #2905
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Utah State Route 18, St. George

An unusual interchange opened to traffic yesterday along SR-18 just north of St. George, Utah.

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Old May 18th, 2015, 11:18 PM   #2906
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What the hell????
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Old May 19th, 2015, 01:42 AM   #2907
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They could have built a standard diamond interchange/SPUI with the same amount of land. Forcing traffic to exit and enter the thoroughfare via the left lane is idiotic in my opinion.
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Old May 19th, 2015, 01:50 AM   #2908
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I like it. Makes you actually pay attention to the road and conditions instead of being a mindless drone.
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Old May 19th, 2015, 01:59 AM   #2909
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Well the lack of merging lanes also makes it unsafe since there is little room for oncoming traffic to safely merge unto the roadway. They should have went with a more conventional design.
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Old May 19th, 2015, 05:03 AM   #2910
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I like it, the road going under now only has to go through one signal cycle.
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Old May 20th, 2015, 12:36 PM   #2911
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Quote:
Originally Posted by ttownfeen View Post
I like it, the road going under now only has to go through one signal cycle.
Was that the main reason behind this unusual design??

Still, designing junction where you have to merge to the fast lane is stupid.

Also, look for the amount of underpasses for what I assume is a cycle path. I can see at least three. Money must be growing on tees in Utah

Why not build single overpass above the main highway??
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Old May 20th, 2015, 12:42 PM   #2912
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Looks like someone got bored and decided to do something ''exciting''
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Old May 20th, 2015, 05:14 PM   #2913
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That type of interchange makes sense if the road is busier than the freeway.
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Old May 20th, 2015, 08:45 PM   #2914
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Quote:
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I like it, the road going under now only has to go through one signal cycle.
If that had been the goal, then the opposing left turn lanes should probably have been offset from each other. They seem to be overlapping or nearly overlapping.
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Old May 21st, 2015, 03:13 AM   #2915
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Quote:
Originally Posted by ttownfeen View Post
I like it, the road going under now only has to go through one signal cycle.
A SPUI can do that more safely.

Reviewing the interchange's former configuration on Google Maps, it appears that the overall goal of this design was cost minimization.
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Old May 21st, 2015, 03:35 AM   #2916
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I think it is important to consider traffic flows

a left exit and left onramp has no safety issue if the road is empty, and especially if the ramps are very long, and in the picture, it basically is (I suspect tricky photo skewing the perspective)

and Utah is plenty empty
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Old May 21st, 2015, 03:55 AM   #2917
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St. George itself is a rapidly growing city so I doubt the roadway will be empty for long.
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Old May 21st, 2015, 02:27 PM   #2918
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St. George is probably the fastest-growing city in the United States that is not a suburb or part of a preexisting metropolitan area.

The city had only 11,000 people as recent as 1980. It has 75,000 today with a metro area of 150,000 people.

They also built a freeway south of St. George (SR-7) that is built for future traffic. It currently carries only 1,200 vehicles per day and is possibly the lowest volume freeway in the United States.
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Old May 21st, 2015, 07:59 PM   #2919
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Quote:
Originally Posted by ADCS View Post
A SPUI can do that more safely.

Reviewing the interchange's former configuration on Google Maps, it appears that the overall goal of this design was cost minimization.
That's why I call this layout a "poor man's SPUI." Here's another one, in Greensboro, NC.
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Old May 22nd, 2015, 03:18 PM   #2920
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WA-520, Seattle

Great shot of the Evergreen Point Floating Bridge replacement project.


May 8, 2015 – New bridge construction stretches across Lake Washington by Washington State Dept of Transportation, on Flickr
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