VIDEO: Diverging Diamond Interchange Begins to Shine in Tennessee

In the United States, the use of diverging diamond interchanges (DDI) is becoming increasingly popular among state transportation departments to improve the flow of vehicle traffic where busy non-freeways intersect with interstates and other freeways. DDIs are based on the idea that if transportation designers and engineers can eliminate the need for left-turn arrows at major intersections, then signals will work more efficiently; the number of conflict points will be lowered; and highways can handle more traffic with better safety and less congestion....

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