Tuesday, August 29, 2017

Confusing!-----Diverging Diamond Interchanges Spreading In the U.S. - CityLab

Diverging Diamond Interchanges Spreading In the U.S. - CityLab
Drivers may be baffled by these newfangled intersections, but they’re safer than traditional four-way stops.

End-of-summer road trippers: Get ready to merge like never before. 
...Here’s a full list of nearly 90 U.S. locations where they’re planned or operational.
DDIs are proliferating because they’re safer than a traditional four-way intersection. 
Where two, two-lane roadways intersect, drivers have 32 separate opportunities to collide into each other. 
In a DDI, there are only 14. The DDI in Springfield, Missouri—the first in the U.S.—showed a 60 percent reduction in crashes since it was installed in 2009, compared to the old design..."

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