Diverging Diamond Interchange Informational Guide, Second Edition (2021) / Chapter Skim
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Pages 9-19
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9 This chapter contains guidance on how to consider alternative intersections and interchanges in general and diverging diamond interchanges (DDIs) in particular.
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10 Diverging Diamond Interchange Informational Guide date have been constructed with bicycle lanes through the crossovers, providing dedicated rightof-way for those road users. Several others have been constructed with bicycle facilities in the form of shared-use paths on the outside of the interchange.
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Policy and Planning 11 Drivers on the cross street who are making a left turn onto the ramps are allowed to continue to the ramps without conflicting with opposing through-traffic. The DDI design has been shown to improve the operations of turning movements to and from the freeway facility and significantly reduce the number of vehicle-to-vehicle conflict points compared to a conventional diamond interchange.
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12 Diverging Diamond Interchange Informational Guide Exhibit 2-3. Example video screen capture from Nevada DOT of how to travel through a DDI (2)
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Policy and Planning 13 to travel through a DDI, with an emphasis on all users of the system. The fact sheet highlights how a pedestrian, bicyclist, and motorist would travel through a DDI in Minnesota.
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14 Diverging Diamond Interchange Informational Guide Exhibit 2-6. Example public outreach brochure used by GDOT (5)
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Policy and Planning 15 asso ciated with alternative intersections. The degree to which motor vehicle throughput should or should not be prioritized over other modes also plays a role in determining the appropriateness of alternative intersections at specific locations.
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16 Diverging Diamond Interchange Informational Guide These goals can range from concepts that preserve a historic character or identified heritage. Some goals may be to create walkable communities or complete streets.
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Policy and Planning 17 2.6 Project Performance Considerations Measuring the effectiveness of a project's overall performance depends on the nature or catalyst for the project. Understanding the intended specific operational, safety, and geometric performance context for each intersection or corridor, including intended users, can help determine project-specific performance measures.
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18 Diverging Diamond Interchange Informational Guide 2.7 Project Development Process For the purposes of this report, the project development process is defined as consisting of the stages described below. Federal, state, and local agencies may have different names or other nomenclature with the overall intent of advancing from planning to implementation.
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Policy and Planning 19 2.7.4 Final Design The design elements are advanced and refined in final design. Typical review periods include 60%, 90%, and 100% plans before completing the final plans, specifications, and estimate.
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