Diverging Diamond Visualization

Simulation of a Diverging Diamond operation

• Category

  Autos & Vehicles

[Scott Blevins]

Concerning if there is a POWER OUTAGE (top voted comment):

The DDI function without any confusion. The geometry will guide drivers to the correct location with the only difference being that there will be a full stop condition at the crossovers instead of a signal control. This is one of the advantages of the DDI over the single point urban interchange (SPUI) or a continuous flow interchange (CFI).

[Shawn Hudson]

If one were to exit the green expressway to fill their gas tank at the corner store and want to continue on the expressway, how is that possible when the service road doesn't cross the intersection?

[NaabiXx]

I dont get it, why make it so complicated when two roundabouts should solve the problem? :o

[TeamTacDotNet]

Huh? Please study the diagram, I prefer a different one than this - it's entirely possible to get back on the highway in the same direction. Point being, it DOES INDEED cross the intersection.

[quest33613]

BRILLIANT!!!!



[locopyro13]

They are building one near me now, the only downside I see is that it is not easy to re-enter the highway if you get off or got off at the wrong exit.

The other annoyance would be if you get off the highway and need to go under the bridge, you will have to stop at two red lights guaranteed, unless you are lucky enough to hit the off ramp light green.

[ask412]

Only an engineer who has never walked or ridden a bicycle anywhere would design this abomination.

[Astat1Go]

Yes, I've seen this in crop circles.

[marigolds6]

"And what the heck happens when the stopped traffic backs up to the criss-cross section?" It can't. Traffic storage backs up into the through road and the arterial, not into the criss-cross. That is why the outside lights go red before the inside lights to red. The dorsett interchange does not even fill up half of the criss-cross storage area during rush hour.

[marigolds6]

This intersection also handles problems much more easily. e.g. power outages, stalled cars, speeders etc. Since there is no left turn lane, that gives an extra through lane to navigate around obstacles. The one time there was a power outage, each light becomes a 2-way stop sign. Extremely smooth to navigate compared to a 4-way stop.

[marigolds6]

I live right next to one of these on Dorsett Rd and I-270 in the St Louis region. Dorsett is a major high traffic arterial. The intersection is very easy to follow; while driving through it, driving on the left feels more correct. It is also much safer than the previous cloverleaf because there are no simultaneous merge on-merge off zones. Traffic can get up to speed right away without making room for exiting merges. The drawback? If you get off the wrong exit, there is no way to get back on.