Traffic & Safety

Diverging Diamond Interchange (DDI)

What Are Diverging Diamond Interchanges?

A Diverging Diamond Interchange (DDI) is an innovative interchange that moves traffic to the opposite side of the crossroad between the two ramp intersections. Diverging Diamond Interchanges have been shown to have numerous benefits, including:

  • Improved safety, especially in busy areas
  • Help traffic move more smoothly
  • Simpler to build
  • Lower cost

They also often occupy less space than other interchange designs requiring loops.

Traditional Diamond Interchange to Diverging Diamond Interchange

-15 Percent
15% Reduction in ALL Crashes
-45 Percent
45% Reduction in SERIOUS Crashes

NOT FINDING WHAT YOU NEED? WE CAN HELP.

Login  |  ©  Iowa Department of Transportation.  All rights reserved.