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New Intersection 1

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IRS... the new turn has two crossing conflicts with one of them at nearly 180 degrees... really bad. If they had exited from the right lane there would only be one crossing conflict. I think it's dangerous the way it was done... with or without the video. Any time you need a video, it's time to find something new...

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik
 
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I have been through a few of these intersections while traveling in the states - I have never had an issue navigating them - good signage makes all the difference. I believe the main advantage is that it allows for more cars to turn left with less disruption (red light time) for the main traffic movements.

Here is a quick summary for the advantages and disadvantages for this type of intersection (Displaced Left Turn) which was provided in this document:
DLT_hjerel.jpg
 
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One thing that looked particularly annoying was one of the left turns requires a very short radius turn to complete the turn; I think that will result in a LOT of slowness, because some people just can't manage tight left turns.

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! faq731-376 forum1529 Entire Forum list
 
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Similar intersection type, but no crossing oncoming traffic at nearly 180 degrees and no way that pedestrians or bicycles would use this. The crossing of on coming traffic was the real scary part... even with light control devices.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik
 
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It would interesting to see the analysis/simulations. I'm thinking that you're effectively making 2 left turns, and during busy times, you'll still be there for many light change cycles.

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! faq731-376 forum1529 Entire Forum list
 
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dik said:
Similar intersection type, but no crossing oncoming traffic at nearly 180 degrees and no way that pedestrians or bicycles would use this
Click to expand...
This statement appears to be aimed at the information I posted, but I am a bit confused because it is the same type of intersection (the name is even referenced in the article you posted) and does include the early crossing of oncoming traffic which is what I believe you are calling the 180° crossing (hence the "displaced" in displaced left turn). As noted as a disadvantage, it does require a two stage crossing for pedestrians. I am guessing most places that would use this intersection type don't have may pedestrians trying to cross anyway though.


IRStuff said:
I'm thinking that you're effectively making 2 left turns, and during busy times, you'll still be there for many light change cycles.
Click to expand...
But, what it does allow is that during the "first" left turn when you cross the oncoming traffic, the cross traffic is still able to go. Then, when you make the second left turn, the oncoming traffic can still be going as you have already crossed them. This is different than a typical intersection where both the cross traffic and oncoming traffic need to be stopped at the same time to allow for a left turn. So, now since the left turn is not holding up traffic in both directions at the same time, it is able to have longer green times without causing more backup in the major directions.

Is it a perfect solution to traffic problems? No. Is it better than a conventional intersection in some places that have restrictions (typically due to space) that prevent a more elaborate intersection type? Yes.


My experience is that roundabouts (or traffic circle, or rotaries) cause way more confusion to inexperienced drivers (or to be more clear, drivers without experience in that particular intersection type) than this type of intersection ever has.
 
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If you look at the video, initially crossing the oncoming traffic is at about a 160 degree angle, not 90... almost head on.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik
 
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I think this is the location in the OP's citation.
I find these intersections to be troublesome mostly due to needing to be in the correct lane for a turn well in advance of the the location the roads cross and the tenancy for the correct lane to be on an unexpected side of the highway. Good signage well in advance helps greatly.

Screenshot_from_2020-11-22_15-05-15_wy6cc1.png


In the US interstate highway system interchanges with similar features are popular at high capacity locations.
 
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I suspect they're dangerous... maybe cheaper and use less real estate... but, life's cheap...

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik
 
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