Diverging Diamond Interchange

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Re: Diverging Diamond Interchange

Postby khaytsus » Thu Aug 18, 2011 2:38 am

Yay me, I get to fix one of these in town now.. Harrodsburg Road under New Circle Road in Lexington construction just (mostly) wrapped up on one of these Double Crossover Diamond, or at least that's what they keep calling it.

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Re: Diverging Diamond Interchange

Postby jondrush » Sat Jan 01, 2011 6:01 am

CBenson wrote: Hey, that looks familiar. I just cleaned up one of those here: http://www.waze.com/livemap/?zoom=15&la ... yers=BTTTT

All the ramps were already there and the arterial road (Telegraph Road) was already split, so I just edited the connectivity to make the intersection work. However, I suspect I will have to go back and simplify the interchange at some point.

Cool, yep that would be a lot easier if Telegraph hill wasn't split. Also prolly shouldn't be a Major Highway, should it. :geek: :mrgreen: :twisted:
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Re: Diverging Diamond Interchange

Postby jondrush » Sat Jan 01, 2011 5:54 am

What I meant was, they can be built without taking any significant additional land from property owners beyond what exists today in a typical urban interchange, where right hand turns are made at a light. A double diamond is wider than a typical urban interchange. The single point only requires lengthened ramps and wider bridges, which will usually be taken from land that is already in the highway right-of-way. Opposition to additional land grabbing is the number one blockade to upgrading urban interchanges.
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Re: Diverging Diamond Interchange

Postby jondrush » Thu Dec 30, 2010 6:26 pm

Single Point Urban Interchanges are more interesting to me, because they can solve existing urban issues without consuming more land.
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Re: Diverging Diamond Interchange

Postby ircphoenix » Thu Aug 18, 2011 5:09 am

I'm pretty sure that I just wrecked my car from even LOOKING at these interchanges. Thanks guys. Thanks.
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Diverging Diamond Interchange

Postby gettingthere » Thu Aug 18, 2011 5:28 am

Ok. You caught me. I didn't read the entire thread.
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Re: Diverging Diamond Interchange

Postby gettingthere » Thu Aug 18, 2011 3:37 am

And what is the logic with this so called 'double diamond' crossing? To cause a head-on collision when someone doesn't think for a second and ends up on the incorrect side of the road?

And what purpose does this serve? Something similar to a traffic circle but more efficient?
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Re: Diverging Diamond Interchange

Postby gerben » Sun Dec 26, 2010 10:56 pm

This is the one in France that is mentioned in the article:

http://world.waze.com/cartouche/?zoom=5 ... FTFTFFTTTT

I think a lot of people need to get used to this kind of intersections before they work OK... It seems unnatural to drive on the left side for a while, but the possibility of turning left onto a freeway ramp without traffic lights or crossing traffic can work OK.
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Re: Diverging Diamond Interchange

Postby Daknife » Wed Apr 18, 2012 2:16 am

This is a rather old thread, but I wanted to add the insight of someone who regularly drives through both DDI's and SPUI's. While both are very efficient, the DDI is actually much more difficult to make a deadly mistake on. The first time I drove through a SPUI, it was early in the morning and I turned a little too far left and found myself on the wrong side of the center divider. Had there been any oncoming traffic there could have been an accident. And that was a newly opened interchange with nice bright paint marking the lines. With a DDI there is no question as to which way you are to go, to turn into oncoming traffic requires an intentional excessive angle turn to the right. It's intuitive, no wondering if you're following the right dashed line.

At first these looked confusing, but after a couple times through I decided they are just the opposite. Now they are cropping up all over the place. As to space requirements compared to a SPUI, the SPUI's in Utah are much wider than a traditional interchange, DDI's are much longer. A couple DDI's that have just opened fit into the space much better than a SPUI would have. The DDI's pushed a interchange back away from the freeway, but required no buildings and very little non-road land land

https://www.waze.com/editor/?zoom=5&lat=40.43123&lon=-111.89165&layers=TFFTFFFFFFTFTFTFFTTTT This one put turn restrictions on the intersection immediately to the west of I-15 and the main stop light was moved to the next intersection to the west. As it was built in an existing underpass it simply couldn't get any wider and it didn't. The whole set of intersections all flow so much more smoothly now than they did before the rebuild. Nobody get's caught waiting in the middle of an intersection waiting to turn left. Which ever way you want to turn, you just get to the appropriate travel lane and take the turn as you move with the flow of traffic. These really do work very well.
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Re: Diverging Diamond Interchange

Postby CBenson » Mon Jan 03, 2011 12:27 pm

jondrush wrote:Cool, yep that would be a lot easier if Telegraph hill wasn't split. Also prolly shouldn't be a Major Highway, should it. :geek: :mrgreen: :twisted:


Yeah, there are a lot of split highways in the base map here that I wouldn't have split. I'm not taking the time yet to convert them. And yeah, Telegraph should probably be a minor highway. But I don't worry much about the labels.
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