Creating effective variable message signs : human factors issues.

Proffitt, Dennis R; Wade, Melissa M · 1998 · ROSA P / Virginia Transportation Research Council (VTRC)

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Summary

This report addresses the human factors influencing the reading and comprehension of Variable Message Signs (VMS), motivated by the Virginia Department of Transportation’s need to standardize messages amidst increasing VMS deployment. Because VMS content varies widely and literacy is not a licensing requirement, the authors conducted a literature review to determine how psychological principles of reading and warning sign perception can optimize message design for diverse motorists. The study synthesizes existing research across four domains: literacy rates, cognitive models of reading, warning sign effectiveness, and sign placement. The authors analyzed data on adult illiteracy in Virginia, noting that approximately 25% of drivers are weak readers who rely heavily on context and are easily disrupted by degraded text. They applied the interactive model of reading, which posits that skilled reading relies on familiarity with word shapes and patterns rather than sequential letter identification. Additionally, the report reviewed empirical studies comparing symbolic versus verbal signs, finding that symbols are recognized faster and from greater distances, particularly under degraded conditions. Key findings indicate that VMS messages must account for low literacy levels by providing clear context and avoiding complex memory demands. The research demonstrates that mixed-case letters are superior to all-caps because they preserve distinctive word shapes, though current flip-disk technology often limits this option. Abbreviations were found to significantly slow reading speeds, with truncated abbreviations performing better than conventional or contraction methods. Furthermore, symbolic messages are consistently more effective than verbal ones, offering faster recognition and greater visibility. The report also challenges standard MUTCD guidelines regarding sign angle, suggesting that angling VMS toward the roadway may improve readability despite potential glare issues. The significance of this work lies in its practical recommendations for VMS deployment and composition. The authors conclude that standardization is critical to leverage motorists' familiarity with specific phrases and symbols, thereby reducing cognitive load and error. They advise using short, concise, explicit directives rather than descriptive conditions, and incorporating symbols to convey essential information. These guidelines aim to ensure that VMS messages are universally understandable, minimizing distraction and enhancing safety for all drivers, regardless of their reading proficiency.

Key finding

Approximately 25% of adult motorists are weak readers, and symbolic signs are recognized more quickly and from greater distances than verbal signs.

Methodology

review

Provenance

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Topics

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• sign visibility legibility
• signage environment