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.