Follow the link for a diagram.
It's not often that you can make traffic flow more smoothly and safely without spending significant time and money. But drivers in Springfield, Mo., are the first in the United States to use a new interchange design that transportation officials say is quick, cheap, and safe.
The "diverging diamond" is being put to the test. Fans of the new highway interchange design say it improves traffic flow by eliminating problematic left turns. There's just one catch: It briefly sends all cars over to the left side of the road.