National Cooperative Highway Research Program

The buyer seeks research to investigate the traversability of 4:1 V-ditches for crash testing cable median barrier systems. The project involves literature review, analysis of critical factors, simulation, and physical testing. The buyer aims to validate and refine definitions for ditch traversability and vehicle stability. Outcomes will include recommendations for updating AASHTO standards and guidelines.

• 2/11/2025 - Proposal Due Date
• 7/1/2025 - Authorization to Begin Work

• Conduct literature review on 4:1 V-ditch traversability
• Review state DOT standards and guidelines for 4:1 ditch geometries
• Define ditch traversability and vehicle stability criteria
• Investigate critical factors affecting 4:1 V-ditch traversability
• Compare performance of 4:1 V-ditches to other 4:1 ditch types
• Verify 4:1 V-ditch traversability using simulation and physical testing
• Develop refined definitions and MASH language for AASHTO consideration
• Execute outreach plan to gather industry feedback
• Revise AASHTO deliverables based on feedback
• Prepare final research report and implementation recommendations