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Vol. XXI • No. 3
“The Nation’s Best Read Construction Newspaper… Founded in 1957.” Your Alabama Connection • Rich Olivier, Atlanta, GA • 1-800-409-1479
Alabama’s First Diverging Diamond Interchange Nearing Completion
By Mary Yamin-Garone & Irwin Rapoport CEG CORRESPONDENTS
Alabama’s first diverging diamond interchange (DDI), reconfiguration of a congested area surrounded by retail development and a large church, is nearing completion at Alabama State Route 181 and Interstate 10 in Baldwin County. Arrington Curb & Excavation Inc. was awarded the $7.3 million contract that began last March and should be completed this spring, pending weather delays. So, what is a diverging diamond interchange? A DDI is a simple design innovation that addresses congestion and safety by allowing vehicles to travel more efficiently through an interchange. It increases traffic flow by temporarily transitioning traffic to the left side of the road, allowing through-traffic and left-turning traffic to proceed through the interchange simultaneously, eliminating the need for a signalized left-turn. see DDI page 6
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