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The diverging diamond interchange (also known as a double crossover diamond interchange) is a relatively new design to the United States. This design can increase throughput and safety without widening bridge structures.

The TRB National Cooperative Highway Research Program's NCHRP Research Report 959: Diverging Diamond Interchange Informational Guide, Second Edition presents a comprehensive guide to the design and operation of diverging diamond interchanges and updates material found in the FHWA’s Diverging Diamond Interchange Informational Guide.

A workshop summary is provided that includes an overview of key traffic signal timing concepts at diverging diamond interchanges—from terminology to timing considerations and from operational analysis to traffic signal equipment. Videos viewed during the workshop are also provided.

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Suggested Citation

National Academies of Sciences, Engineering, and Medicine. 2021. Diverging Diamond Interchange Informational Guide, Second Edition. Washington, DC: The National Academies Press. https://doi.org/10.17226/26027.

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Publication Info

8.5 x 11 |  DOI: https://doi.org/10.17226/26027
Chapters skim
Front Matter i-x
Chapter 1 - Introduction 1-8
Chapter 2 - Policy and Planning 9-19
Chapter 3 - Multimodal Considerations 20-58
Chapter 4 - Safety 59-66
Chapter 5 - Conceptual Operations 67-120
Chapter 6 - Geometric Design 121-187
Chapter 7 - Traffic Control Devices and Illumination Applications 188-214
Chapter 8 - Construction and Implementation 215-220
Appendix - Safety Details 221-240

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