Visually Impaired Pedestrian Safety at Roundabout Crossings

Christofa, Eleni; Ganz, Aura; Knodler, Michael A.; Wolfgram, Joshua; Fournier, Nicholas · 2017 · ROSA P / Safety Research Using Simulation (SAFER-SIM) University Transportation Center

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Summary

This research addresses the safety challenges visually impaired pedestrians face at roundabout crossings, where continuous traffic flow obscures the auditory cues necessary for safe navigation. While roundabouts improve traffic operations, they lack the protected pedestrian phases found at signalized intersections, placing a disproportionate burden on pedestrians to judge safe gaps. Existing literature has largely focused on pedestrian behavior or signalization treatments that compromise roundabout efficiency. This study shifts the focus to driver compliance, aiming to design a novel pedestrian-activated yield sign that alerts drivers to pedestrian presence, thereby increasing yielding behavior and improving situational awareness. The methodology involved designing a new yellow diamond warning sign featuring a symbolic roundabout and crosswalks. When a pedestrian is detected via active (push-button) or passive (infrared) means, the corresponding crosswalk symbol on the sign flashes to warn approaching drivers. To test this design, the researchers developed an experimental protocol using a driving simulator at the University of Massachusetts Amherst. Participants, aged 19–38 with valid licenses, completed two simulated drives. The first drive utilized conventional yield signage, while the second employed the proposed pedestrian-activated sign. Each drive included four roundabouts, with two scenarios containing pedestrians and two without, ensuring varied turn maneuvers and traffic conditions. Data collection integrated eye-tracking devices to monitor driver gaze patterns, simulator logs to record speed and trajectory, and pre- and post-study questionnaires to assess demographic factors and sign comprehension. The study outlines specific hypotheses regarding driver behavior and sign effectiveness. Researchers anticipate that the flashing nature of the proposed sign will increase the frequency of eye glances toward the signage compared to conventional signs. Furthermore, the study posits that repeated exposure to the new signage will lead to increased yielding rates and improved driver compliance. The eye-tracking data is intended to verify whether drivers actively look for the sign and pedestrians, while speed and position data will determine if drivers adjust their trajectories and stop earlier when the new sign is active. The questionnaires aim to correlate driver understanding of the sign’s meaning with their yielding behavior. The significance of this work lies in its potential to enhance universal access and safety at roundabouts without undermining their operational benefits. By shifting responsibility toward driver awareness through intuitive signage, the research seeks to reduce cognitive load for drivers and provide safer crossing conditions for visually impaired users. The findings are expected to inform future design standards, driver education, and countermeasures. Additionally, the study lays the groundwork for future research involving smartphone applications that could connect visually impaired pedestrians directly with these warning systems, further integrating technology into pedestrian safety infrastructure.

Methodology

theoretical

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

Topics

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• vru facing ehmi
• driver vru interaction
• ehmi external hmi

Information type

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• Methodological Resource: tool software