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Road planners embrace the diverging diamond interchange
An unconventional design known as the diverging diamond interchange can be both safer and more efficient than conventional left turn lanes. Road planners across the country are switching sides.
Joel Rose/NPR Chlewicki agreed to meet at this intersection 35 miles west of Washington, D.C. to explain the workings of the diverging diamond interchange, as it's known. Whitney Shefte for NPR The idea caught the attention of engineers at the Federal Highway Administration, who began pushing to make it a reality. He's experimenting with some new "mutations" of the diverging diamond, as he puts it, combining them with roundabouts and other innovative traffic design — still playing with model cars and paper.
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