When driving on the wrong side of the road is the right way to speed up traffic

When driving on the wrong side of the road is the right way to speed up traffic Loading. Enlarge this image toggle caption Joel Rose/NPR 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. "When we do the cross-over to the left side of the road, that's when the left turns happen, so the left is very easy," says Chlewicki. Enlarge this image toggle caption Whitney Shefte for NPR Whitney Shefte for NPR Making left turns safer and more efficient The first state to install a diverging diamond interchange was Missouri, way back in 2009. 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.