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diverging diamond

The state put the first diverging diamond at a notoriously traffic-clogged intersection in Springfield where it could often take as long as 20 minutes to make a left turn.

The state put the first diverging diamond at a notoriously traffic-clogged intersection in Springfield where it could often take as long as 20 minutes to make a left turn. Whitney Shefte for NPR hide caption

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Whitney Shefte for NPR

National

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

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.

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