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 Diverging Diamond Intersection
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Description: Replace the traditional intersection with a diverging diamond intersection (DDI). A DDI is a new intersection design that can improve traffic flow and reduce congestion. It changes the normal four-phase signal operations to a more-efficient two-phase operation, which allows more flexibility addressing current and future traffic volumes. The highway is connected to the main cross street by on-ramps and off-ramps in a manner similar to a conventional diamond intersection. However, on the cross street, the traffic moves to the left side of the roadway between the frontage roads. This allows the vehicles on the cross street that need to turn left onto the ramps to continue to the on-ramps without conflicting with the opposing through traffic.

Budget: Estimated under $4,000,000

Project Phase: Project is managed by TxDOT

Project Manager: Bill Stablein- (512) 218-3237

Project Timeline: Work is scheduled to begin in August 2014 and continue until August 2015. Work has begun West of IH 35.

Engineer: Brown and Gay

Construction Contractor: Capital Excavation

Project Map:


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City of Round Rock | 221 East Main Street, Round Rock, Texas 78664 | Phone: (512) 218-5400
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