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

  • 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.

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

 

Diverging Diamond Interchange Locations

Interchange Location Date Opened
I-44 @ MO 13 Springfield, MO Jun 21, 2009
US 60 @ National Ave Springfield, MO Jul 12, 2010
I-15 @ American Fork American Fork, UT Aug 23, 2010
I-270 @ Dorsett Rd Maryland Heights, MO Oct 17. 2010
US 129 @ Middlesettlements Rd Alcoa, TN Dec 14, 2010
KY 4 @ US 68 Lexington, KY Aug 14, 2011
I-15 @ Timpanogos Hwy Highland, UT Aug 14, 2011
SR 201 @ Bangerter Hwy West Valley, UT Oct 23, 2011
I-435 @ Front Street Kansas City, MO Nov 6, 2011
I-15 @ 500 East American Fork, UT Nov 7, 2011
US 65 @ MO 248 Branson, MO Jan 22, 2012
I-285 @ Ashford-Dunwoody Rd Dunwoody, GA Jun 3, 2012
MD 295 @ Arundel Mills Blvd Hanover, MD Jun 11, 2012
US 67 @ SR 221 Farmington, MO Sept 5, 2012
I-590 @ South Winton Road Brighton, NY Sept 11, 2012
US 65 @ Chestnut Expressway Springfield, MO Nov 10, 2012
I-580 @ Moana Lane Reno, NV Nov 21, 2012
MO 150 @ Botts Road Kansas City, MO Dec 5, 2012
I-85 @ Pleasant Hill Road Duluth, GA Jun 9, 2013
I-44 @ Range Line Road Joplin, MO Jul 20, 2013
US 60 @ MO 13 Springfield, MO Aug 18, 2013
US 52 @ New Olmsted County Road 12 Oronoco, MN Sept 3, 2013
I-70 @ Woods Chapel Road Blue Springs, MO Sept 26, 2013
I-86 @ Yellowstone Ave (US 91) Chubbuck, ID Oct 7, 2013
I-35 @ Homestead Lane Gardner, KS Oct 11, 2013
I-70 @ Stadium Blvd Columbia, MO Oct 14, 2013
I-25 @ College Drive Cheyenne, WY Oct 14, 2013
SR 15 @ SR 120 Stearns County Rd. St. Cloud, MN Oct 17, 2013
I-270 @ Roberts Road Columbus, OH Oct 21, 2013
I-70 @ Mid-Rivers Mall Drive St. Peter’s, MO Oct 28, 2013
I-494 @ 34th Ave Bloomington, MN Nov 17, 2013
I-15 @ St. George Blvd St. George, UT Nov 19, 2013
I-64 @ US 15 Zion Crossroads, VA Feb 22, 2014
I-70 @ US 6 / US 50 Grand Junction, CO Feb 27, 2014
I-77 @ Catawba Avenue Cornelius, NC Jun 29, 2014
I-29 @ Tiffany Springs Pkwy Kansas City, MO July 12, 2014
I-15 @ UT 130, Cross Hollow Rd Cedar City, UT August 25, 2014
Loop 375 @ Spur 601 El Paso, TX Sept 2, 2014
I-85 @ Poplar Tent Road Cabarrus County, NC Sept 7, 2014
I-15, I-85 @ US 91, 1100S Brigham City, UT Sept 16, 2014
I-69 @ IN 1 DuPont Rd Ft Wayne, IN Sept 22, 2014