Diverging Diamond Interchange Informational Guide, Second Edition (2021) / Chapter Skim
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1 1.1 Overview of Alternative Intersections and Interchanges Alternative intersections and interchanges offer the potential to improve safety and reduce delay at a lower cost and with fewer impacts than traditional solutions. However, transportation professionals are generally unfamiliar with many alternative intersection and interchange forms, partially because some forms have only a few installations in operation or because installations are concentrated in a few states.
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2 Diverging Diamond Interchange Informational Guide 1.3 Organization of the Guidelines This guide has been structured to address the needs of a variety of readers, including the general public, policy makers, transportation planners, operations and safety analysts, and conceptual and detailed designers. This chapter distinguishes diverging diamond interchanges (DDIs)
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Introduction 3 crossovers on either side of the interchange. This eliminates the need for left-turning vehicles to cross the paths of approaching through-vehicles.
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Exhibit 1-2. First constructed DDI in Utah at Pioneer Crossing and Interstate 15 (American Fork, Utah)
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Introduction 5 Exhibit 1-5. First constructed DDI in Idaho at Interstate 86 and US-91/Yellowstone Highway (Pocatello-Chubbuck, Idaho)
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6 Diverging Diamond Interchange Informational Guide Exhibit 1-8. Pedestrian crossing at the right-turn lane of the exit located at Pioneer Crossing and Interstate 15 DDI (American Fork, Utah)
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Introduction 7 Exhibit 1-11. DDI (underpass)
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8 Diverging Diamond Interchange Informational Guide • Highway Safety Manual (HSM)
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