From Maneuver to Mishap: A Systematic Literature Review on U-Turn Safety Risks

TL;DR

This systematic review synthesizes research on U-turn safety risks, highlighting innovative design interventions and technological strategies to improve intersection safety and traffic flow across diverse environments.

Contribution

It provides a comprehensive analysis of U-turn safety challenges and solutions, guiding transportation safety improvements through evidence-based insights.

Findings

Innovative design interventions like RCUTs and MUTs improve safety.

Technological advancements contribute to better traffic management at U-turns.

Diverse regional studies highlight context-specific safety strategies.

Abstract

Understanding the impacts of U-turn configurations on intersection safety and traffic operations is essential for developing effective strategies to enhance road safety and efficiency. Extensive research has been conducted to investigate the role of geometric designs, driver behavior, and advanced technologies in mitigating crash risks and improving traffic flow at U-turn facilities. By synthesizing this collective body of work through the guidelines of Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA), this paper provides a valuable resource for transportation professionals, policymakers, and researchers seeking evidence-based solutions. This systematic review draws on studies from diverse traffic environments and regional contexts, focusing on innovative design interventions, such as restricted crossing U-turns (RCUTs) and median U-turn intersections (MUTs), as well as integrated strategies leveraging technological advancements. By presenting a comprehensive analysis of U-turn-related challenges and opportunities, this review contributes to advancing transportation safety research and guiding the development of adaptive strategies tailored to varied traffic conditions and evolving technologies.