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Diverging Diamond Interchange

Diverging Diamond Interchange (DDI)

A Diverging Diamond Interchange (DDI), also known as a double crossover diamond (DCD), is a diamond interchange that crosses traffic to the opposite side of the road across an interchange so vehicles have unimpeded movement onto the freeway ramps. Left-turn movements, which are a typical challenge with standard four-way interchanges, are eliminated with a DDI.


 

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Under Design or Construction

ProjectLocationDelivery Method
I‐85 at SR 140/Jimmy Carter Blvd
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Norcross, Gwinnett CountySpecial Encroachment Permit
I‐75 at Wade Green Road
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Acworth, Cobb CountyOperational Improvement Project

I-285 @ SR 6/Camp Creek Pkwy

Fulton CountyNA

I-75  SR 20/McDonough-Hampton Rd

Henry CountyNA

In Operation

ProjectLocationDelivery Method
I‐285 at Ashford Dunwoody Road
Dunwoody, DeKalb CountyGDOT Project
I‐85 at Pleasant Hill Road
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Duluth, Gwinnett CountySpecial Encroachment Permit
I‐95 at SR 21
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Pooler, Chatham CountyDesign‐Build
I‐75 at Windy Hill Road
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Marietta, Cobb CountyStandard Project



Safety Benefits

  • Fewer conflict points
  • Wrong Way entry to ramps extremely difficult
  • Reduced speeds through intersections
  • Minimal driver confusion

Under Consideration

ProjectLocationDelivery Method
I‐285 at SR 6/Camp Creek Pkwy
East Point, Fulton CountyNA
I‐75 at SR 20
McDonough, Henry CountyNA
SR 10 loop at SR 8/SR 10/Atlanta Hwy
Athens, Clarke CountyNA
SR 22/US 80 at Bradley Park Drive
Columbus, Muscogee CountyNA