Diamonds: A DOT's best friend

By Robert Austin

In October 2016, the Texas DOT is scheduled to bid a $60 million construction project for two miles of State Loop 1 that contains the intersection of State Loop 1 and Slaughter Lane in South Austin. The agency considered conventional diamond and single-point urban interchanges, but chose a configuration that’s gaining popularity for its safety and efficiency: the diverging diamond interchange (DDI).

Also known as double-crossover diamond interchanges, DDIs are grade-separated interchanges in which the non-freeway/cross-street traffic crosses to the left side of the street, proceeds across the freeway, and crosses back to the right side of the street

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