December 4, 2009 5:24 PM

Innovation: Missouri leads in use of French highway exit design

Hailed by Popular Science magazine as one of the top innovations of 2009, the design features a traffic signal that moves both directions of traffic to the opposite side of the road before crossing the freeway. That permits drivers to make left turns onto the highway without stopping at another red light. Experts say Missouri has emerged as the nation’s leader in designing this "diverging diamond interchange."

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