Welcome to the official website of the diverging diamond interchange. Here, you can learn all about the diverging diamond interchange including:

NEW!!! Registration is now open for the Symposium on Alternative Intersections and Interchanges being held July 20-23, 2014 in Salt Lake City, Utah. DDIs will be heavily discussed at this conference. For registration and conference information, click HERE. Register today!

  • What is the diverging diamond interchange (DDI) and how it works
  • How the design can significantly improve traffic operations
  • Why the design is considered a safer design than other diamond interchange forms
  • Why this concept is such a low cost solution
  • The history of the DDI
  • Specific features related to the design

This website is brought to you by ATS/American. Although this website is targeted primarily to transportation engineers and planners, it also provides the background necessary that allows any transportation enthusiast to learn about this innovative design. All questions, comments, and suggestions can be directed to gchlewicki@ats-american.com Additional updates will be placed on the website when possible. 

Photo: Aerial photo of I-44 / Kansas Expressway Diverging Diamond Interchange in Springfield, Missouri.  First of its kind in the U.S.  Photo from Missouri Department of Transportation.


I-44 @ MO 13 Kansas Expressway - Springfield, Missouri

US 60 James River Freeway @ National Avenue - Springfield, Missouri

I-15 @ American Fork Main Street - American Fork, Utah

I-270 & Dorsett Road - Maryland Heights, Missouri

US 129 Bypass / SR 115 @ Middlesettlements Road / Bessemer Street - Alcoa, Tennessee

I-15 @ SR 92 Timpanogos Highway - Highland, Utah

KY Route 4 (New Circle Road) @ US 68 (Harrodsburg Road) - Lexington, Kentucky

Bangerter Highway @ SR 201 - West Valley City, Utah

I-15 @ 500 East - American Fork, Utah

I-435 @ Front Street - Kansas City, Missouri

US 65 @ SR 248 - Branson, Missouri

I-285 @ Ashford-Dunwoody Road - Dunwoody, Georgia

MD 295 @ Arundel Mills Boulevard - Hanover, Maryland

US 67 @ SR 221 - Farmington, Missouri

I-590 @ South Winton Road - Brighton, New York

US 65 @ Chestnut Expressway - Springfield, Missouri

I-580 @ Moana Lane - Reno, Nevada

MO 150 @ Botts Road - Kansas City, Missouri

I-85 @ Pleasant Hill Road - Duluth, Georgia

I-44 @ Range Line Road - Joplin,  Missouri

US 60 @ MO 13 Kansas Expressway = Springfield, Missouri

US 52 @ New Olmsted County Road 12 - Oronoco,  Minnesota

I-70 @ Woods Chapel Road - Blue Springs, Missouri

I-86 @ Yellowstone Avenue - Chubbuck, Idaho

I-35 @ Homestead Lane - Edgerton, Kansas

I-70 @ Stadium Blvd - Columbia, Missouri

I-25 @ College Drive - Cheyenne, Wyoming

Highway 15 @ County Road 120 - St. Cloud, Minnesota

I-270 @ Roberts Road - Columbus, Ohio

I-70 @ Mid Rivers Mall Drive - St,. Peter's, Missouri

I-494 @ 34th Street - Bloomington, Minnesota (has light rail going through DDI!)

I-15 @ St. George Boulevard - St. George, Utah

NEW!!! I-64 @ US 15 - Zion Crossroads, Virginia

NEW!!! I-70 @ US 6 / US 50 - Grand Junction, Colorado

Please contact us if you know of an additional location where a DDI is opened to traffic.