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https://www.nationalacademies.org/trb/events

Evaluation of Alternative Intersection and Interchange Options for Nebraska

The Nebraska Department of Transportation (NDOT) has implemented and developed guidance for a limited set of unconventional designs (e.g., certain RCUTs and diverging diamond interchanges) and has accumulated experience through selected projects and research studies. NDOT lacks robust, Nebraska-specific tools to: (1) screen and select candidate unconventional facilities; (2) quantify trade-offs in operations, safety, and cost; and (3) develop practical guidelines that can be directly used by designers, planners, and district staff. This gap creates uncertainty when considering unconventional options and may limit NDOT’s ability to fully leverage designs that could offer meaningful safety and mobility benefits. The proposed research will provide NDOT with a structured and evidence-based approach for identifying the most suitable unconventional intersection and interchange options for Nebraska. By evaluating both the designs already implemented within the state and additional alternatives that may be considered soon, the study will broaden NDOT’s understanding of how various unconventional treatments perform under different traffic, geometric, and environmental conditions in Nebraska.