Improved Pedestrian Safety at Signalized Intersections Operating the Flashing Yellow Arrow

Hurwitz, David S.; Monsere, Chris; Tuss, Halston; Paulsen, Kirk; Marnell, Patrick · 2013 · ROSA P / Oregon Transportation Research and Education Consortium

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Summary

This study investigates driver behavior and pedestrian safety at signalized intersections utilizing the Flashing Yellow Arrow (FYA) for protected/permissive left turns (PPLTs). While the FYA was adopted in the 2009 Manual on Uniform Traffic Control Devices (MUTCD) to reduce delay and eliminate "yellow trap" conflicts, its implementation introduces complex yielding requirements where drivers must navigate opposing vehicles and pedestrians simultaneously. The research addresses a gap in understanding how specific operational variables—namely opposing traffic volume, pedestrian presence and direction, and signal head configuration—affect driver visual attention and performance during these maneuvers. To evaluate these factors, the researchers employed a high-fidelity, motion-based driving simulator at Oregon State University, validated against field data. Twenty-seven subjects completed a six-intersection course, generating 620 permissive left-turn maneuvers for analysis. The experimental design manipulated three independent variables: opposing vehicle volume (zero, three, or nine vehicles), pedestrian activity (none, one walking toward or away, or four pedestrians), and signal configuration (three-section dual-arrow vs. four-section vertical heads). Mobile eye-tracking equipment recorded drivers' fixations on areas of interest, including the signal indication, pavement markings, and pedestrian zones, allowing for precise measurement of visual attention duration and focus. The analysis yielded four primary findings regarding driver visual behavior. First, increased pedestrian presence caused drivers to allocate significantly more visual attention to crossing pedestrians. Second, as the volume of opposing vehicles increased, drivers spent less time fixating on pedestrians, suggesting that vehicular traffic competes for and dominates driver attention. Third, between four and seven percent of drivers failed to focus on pedestrians in the crosswalk entirely, indicating a non-trivial risk of inattention. Finally, there was no statistically significant difference in driver performance or visual fixation patterns between three-section and four-section signal heads. These results have direct implications for traffic engineering practice and policy. The finding that drivers neglect pedestrians when opposing traffic is heavy suggests that limiting permissive left-turn operations during periods of high pedestrian activity may enhance safety. Additionally, the lack of performance difference between signal configurations implies that the additional cost of installing four-section signal heads is not justified by improved driver behavior or safety outcomes. The study confirms that while the FYA improves operational efficiency, it requires careful management of conflicting movements to mitigate pedestrian safety risks.

Key finding

Drivers spent less time fixating on pedestrians as the number of opposing vehicles increased, and four to seven percent of drivers did not focus on pedestrians in the crosswalk during permissive left turns.

Methodology

simulator

Sample size: 27

Provenance

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Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.

Topics

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• driver vru interaction
• pedestrian behavior perception
• vru facing ehmi
• signaling behavior