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About Chlewicki

Gilbert Chlewicki, P.E., Division Director at ATS/American is the “father of the DDI” and is considered the national expert on the DDI. As you will read in the history section, Chlewicki came up with the idea of the DDI back in 2000 and wrote a term paper on the idea. The name “diverging diamond interchange” […]

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Benefits

Safety Benefits Fewer conflict points (14 for DDI, 26 for conventional) Conflict points spread out throughout interchange Better sight distance at turns Virtually no driver confusion (FHWA study and new DDI observations in Springfield, MO) Traffic calming features when desired Wrong way entry to ramps extremely difficult Pedestrian crossings are shorter Supporting Data MODOT survey […]

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History

In the Fall of 2000, Gilbert Chlewicki, currently ATS/American’s division director, but back then a first semester graduate student at the University of Maryland, College Park was beginning his graduate work for a master’s degree in transportation engineering. In one of his classes, Chlewicki needed to write a term paper on any transportation related topic. […]

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ATS Courses

AMD – Access Management Design CSD – Compete Street Design CSS – Context Sensitive Solutions IGD – Innovative Geometric Design ML – Managed Lanes SUS – Sustainability in Transportation TDM – Transportation Demand Management TFC – Traffic Flow Considerations TSM – Transportation Systems Management

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Consulting Services

Here’s what ATS/American can offer for your DDI needs: Not sure whether the DDI is a good interchange solution? ATS/American can quickly analyze how good of a fit the DDI can be and what would be best for the situation. ATS/American believes that all interchange improvements should at least investigate the DDI as a preliminary […]

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DDI Openings by Date

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 […]

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