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

#CADDC1
  Interchange Location Date Opened
1 I-44 @ MO 13 Springfield, MO Jun 21, 2009
2 US 60 @ National Ave Springfield, MO Jul 12, 2010
3 I-15 @ American Fork American Fork, UT Aug 23, 2010
4 I-270 @ Dorsett Rd Maryland Heights, MO Oct 17. 2010
5 US 129 @ Middlesettlements Rd Alcoa, TN Dec 14, 2010
6 KY 4 @ US 68 Lexington, KY Aug 14, 2011
7 I-15 @ Timpanogos Hwy Highland, UT Aug 14, 2011
8 SR 201 @ Bangerter Hwy West Valley, UT Oct 23, 2011
9 I-435 @ Front Street Kansas City, MO Nov 6, 2011
10 I-15 @ 500 East American Fork, UT Nov 7, 2011
11 US 65 @ MO 248 Branson, MO Jan 22, 2012
12 I-285 @ Ashford-Dunwoody Rd Dunwoody, GA Jun 3, 2012
13 MD 295 @ Arundel Mills Blvd Hanover, MD Jun 11, 2012
14 US 67 @ SR 221 Farmington, MO Sept 5, 2012
15 I-590 @ South Winton Road Brighton, NY Sept 11, 2012
16 US 65 @ Chestnut Expressway Springfield, MO Nov 10, 2012
17 I-580 @ Moana Lane Reno, NV Nov 21, 2012
18 MO 150 @ Botts Road Kansas City, MO Dec 5, 2012
19 I-85 @ Pleasant Hill Road Duluth, GA Jun 9, 2013
20 I-44 @ Range Line Road Joplin, MO Jul 20, 2013
21 US 60 @ MO 13 Springfield, MO Aug 18, 2013
22 US 52 @ New Olmsted County Road 12 Oronoco, MN Sept 3, 2013
23 I-70 @ Woods Chapel Road Blue Springs, MO Sept 26, 2013
24 I-86 @ Yellowstone Ave (US 91) Chubbuck, ID Oct 7, 2013
25 I-35 @ Homestead Lane Gardner, KS Oct 11, 2013
26 I-70 @ Stadium Blvd Columbia, MO Oct 14, 2013
27 I-25 @ College Drive Cheyenne, WY Oct 14, 2013
28 SR 15 @ SR 120 Stearns County Rd. St. Cloud, MN Oct 17, 2013
29 I-270 @ Roberts Road Columbus, OH Oct 21, 2013
30 I-70 @ Mid-Rivers Mall Drive St. Peter’s, MO Oct 28, 2013
31 I-494 @ 34th Ave Bloomington, MN Nov 17, 2013
32 I-15 @ St. George Blvd St. George, UT Nov 19, 2013
33 I-64 @ US 15 Zion Crossroads, VA Feb 22, 2014
34 I-70 @ US 6 / US 50 Grand Junction, CO Feb 27, 2014
35 I-77 @ Catawba Avenue Cornelius, NC Jun 29, 2014
36 I-29 @ Tiffany Springs Pkwy Kansas City, MO July 12, 2014
37 I-15 @ UT 130, Cross Hollow Rd Cedar City, UT August 25, 2014
38 Loop 375 @ Spur 601 El Paso, TX Sept 2, 2014
39 I-85 @ Poplar Tent Road Cabarrus County, NC Sept 7, 2014
40 I-15, I-85 @ US 91, 1100S Brigham City, UT Sept 16, 2014
41 I-69 @ IN 1 DuPont Rd Ft Wayne, IN Sept 22, 2014
42 I-85 @ NC 73 Charlotte, NC Oct 27, 2014
43 MN 101 Main Street @ 141st Avenue Rogers, MN Oct 29, 2014
44 I-435 @ Roe Avenue Overland Park, KS Oct 30, 2014
45 I-515 @ Horizon Drive Henderson, NV Jan 25, 2015
46 US 65 @ Battlefield Road Springfield, MO February 14, 2015
47 I-85 @ Jimmy Carter Blvd Norcross, Georgia (ATL) March 29, 2015