A Diverging Diamond Interchange (DDI) is a type of interstate interchange where motorists entering/exiting the interstate cross to the opposite side of the road as they go through an interchange. This allows for continuous movements onto the interstate ramps. Signalized high volume left-turn movements, which are a typical challenge with standard four-way interchanges, are optimized with a DDI.
Diverging Diamond Interchanges (DDIs) have been shown to increase capacity and safety, reduce congestion, and minimize the cost of new infrastructure. Advantages include:
Construction is tentatively scheduled to be completed in June 2023.
When entering the Diverging Diamond Interchange (DDI), drivers cross over to the other side of the road, guided by signals, signs, and pavement markings. During this time, traffic functions like a one-way street and drivers make a free flowing left turn onto the interstate.
Motorists turning right do not have to stop to access the ramp and through traffic continues to a second set of traffic lights. Pedestrians travel on designated walkways and cross only at the crosswalks.
Yes. Four alternatives were considered as part of a planning study of this interchange. The options considered included a Standard Diamond Interchange, a Single Point Interchange, a Diverging Diamond Interchange, and a do-nothing option. The DDI was the best option to:
Construction started in February 2021.