Engineering Project Case Studies | Erdman Anthony

Diverging Diamond Interchange

Interstate 590/Winton Road, Diverging Diamond Interchange

During the morning rush hour, the Winton Road exit off I-590 in Rochester, NY, would become extremely backed up. Motorists trying to access I-590 from Winton Road in the afternoon also would experience long backups and delays. In addition, the interchange had a crash history significantly higher than similar higher traffic interchanges throughout the state.

To solve this problem, NYSDOT chose to construct a Diverging Diamond Interchange — an innovative design that delivers smoother traffic flow, reduces backups and delays, and improves motorist and pedestrian safety. In addition to the safety factors, the Diverging Diamond Interchange was chosen over other options because it would take the shortest amount of time to construct, require the least amount of real estate, and provide the best cost value. Erdman Anthony was brought in to help in 2012.

Due to the unique nature of the project’s geometry, typical methods were not used to develop the pavement elevations and slopes. Instead, Erdman Anthony created a 3D model of the corridor that the contractor used for grading and final pavement construction. Services our firm provided for the $5 million construction project also included geometry modifications during construction, traffic-signal design, curb and island layout and details, retaining-wall design, cross-section views of the corridor, temporary traffic signals, and a construction cost estimate.

The project’s primary goals of reducing accidents and protecting people traveling through the interchange — as well as improving traffic flow to minimize commuter delays and frustration — have been achieved. Accidents in the interchange are down by 38 percent. There also has been a significant reduction in feeder-roadway accidents.


Award icon
2013 Award of Merit
Engineering News-Record (ENR), New York’s Best Projects Competition
Award icon
2013 Project of the Year Award
American Public Works Association (APWA), Western NY Branch
Award icon
2014 Diamond Award
American Council of Engineering Companies (ACEC) of New York
Award icon
2014 National Recognition Award
American Council of Engineering Companies (ACEC), National
Paul Presutti, PE, PTOE
Paul Presutti, PE, PTOE
 585-427-8888 x 1093