Update of Intersection/Interchange Guidelines for Rural Expressways in Nebraska

Update of Intersection/Interchange Guidelines for Rural Expressways in Nebraska NDOT staff frequently deals with the decision to change an existing two-way STOP-controlled expressway intersection to either a signalized intersection or an interchange. Current guidelines for such decisions are in the "Interchange vs. at-grade intersection on rural expressways" report No. TRP-02-25-91, May 1992. This report deals with conversion of two-way STOP-controlled intersections to either a signalized intersection or a full diamond interchange with STOP-controlled off ramps. The report is dated and NDOT staff needs guidance on additional options (e.g., roundabouts, RCUT) besides the two mentioned in the report. This research is proposed to update the guidance in the report using the latest cost components (e.g., crash costs) and newer methodology that incorporates additional options besides the original two (signalized intersection and full diamond interchange). The proposed research would consist of updated methodology for three major components: 1) Assessment of operational efficiency and associated costs based on current state-of-art method adjusted to Nebraska conditions, 2) Safety and associated cost estimations based on recent crash data, and 3) Construction cost assessment based on recent market values and practices. The original research relied on the Highway Capacity Software (HCS). The proposed research will also utilize calibrated and validated microsimulation models for Nebraska conditions to assess in-depth operational impacts. The research will update and supplement existing guidelines.


    • English


    • Status: Active
    • Funding: $179,316.00
    • Sponsor Organizations:

      Nebraska Department of Transportation

      1500 Nebraska 2
      Lincoln, NE  United States  68502
    • Project Managers:

      Halsey, Lieska

    • Principal Investigators:

      Khattak, Aemal

    • Start Date: 20230701
    • Expected Completion Date: 20250531
    • Actual Completion Date: 0

    Subject/Index Terms

    Filing Info

    • Accession Number: 01881385
    • Record Type: Research project
    • Source Agency: Nebraska Department of Transportation
    • Files: RIP, STATEDOT
    • Created Date: Apr 27 2023 3:22PM