Unconventional interchange design solutions provide options that agencies explore to overcome pitfalls associated with conventional solutions for congested diamond interchanges. Unconventional designs involve rerouting one or more movements’often left turns’to reduce the number of conflict points remaining in the middle of the interchange which allows reduction in signal phases, less lost time, fewer opportunities for crashes, and other potential operational, safety, and environmental benefits. The most prominent unconventional service interchange design with no loops and no (substantive) weaving at the moment is the double crossover diamond (DCD) interchange, also known as the diverging diamond interchange.