Date of Award
1-1-2025
Document Type
Thesis
Degree Name
M.S. in Engineering Science
First Advisor
Amir Molan
Second Advisor
Srinivas Pulugurtha
Third Advisor
Joseph Hummer
School
University of Mississippi
Relational Format
dissertation/thesis
Abstract
Increasing traffic volumes and intersection-related crashes on rural highways have prompted the adoption of Restricted Crossing U-Turn (RCUT) designs as a safer and more efficient alternative to traditional intersections. RCUTs redirect minor road traffic to make right turns and U-turns, eliminating direct left turns and crossings, thereby reducing conflict points and enhancing safety. This study provides updated guidance on unsignalized RCUTs, focusing on geometric design, operational efficiency, safety performance, and cost-effectiveness. Key findings include the superior performance of shorter U-turn offsets (600–900 ft) with acceleration lanes, and the cost-effectiveness of temporary RCUTs, which offer immediate safety benefits at lower construction costs ($65,000–$110,000) and achieve higher benefit-cost ratios (94.0) compared to full RCUTs (19.4). Public acceptance is identified as a critical factor, with recommendations for targeted education campaigns and tools like the Public Acceptance Scoring System (PASS) to address concerns. Methodologies such as Safe System Intersection (SSI) analysis and the 20-flag method are introduced to evaluate pedestrian and bicyclist accommodations. Additionally, detailed geometric and operational data, including lane configurations, U-turn spacing, and taper lengths, are provided to support tailored RCUT designs. By integrating crash data, microsimulation modeling, and public feedback, this resource serves as a comprehensive guide for transportation professionals, enabling informed decision-making to enhance intersection safety, operational performance, and cost efficiency.
Recommended Citation
Hill, Troy, "A Study on The Geometric Design and Operations of Restricted Crossing U-Turns" (2025). Electronic Theses and Dissertations. 3294.
https://egrove.olemiss.edu/etd/3294