The effects of damage on sign visibility: An assist in traffic sign replacement

Khalilikhah, Majid; Heaslip, Kevin · 2016 · OpenAlex-citations

DOI: 10.1016/j.jtte.2016.03.009

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Summary

This study investigates the impact of physical damage on the retroreflectivity of traffic signs, addressing a gap in literature that has historically prioritized sign age as the primary predictor of visibility. The research is motivated by the need for transportation agencies to comply with the Manual on Uniform Traffic Control Devices (MUTCD), which mandates minimum retroreflectivity levels for nighttime visibility. While agencies often rely on "expected sign life" for replacement scheduling, previous studies have shown that age alone is an unreliable predictor. This paper aims to quantify how specific forms of damage affect sign performance to inform more effective management and replacement strategies. The researchers collected data from 1,683 in-service traffic signs across Utah, representing various climatological regions and roadway types. Using a handheld retroreflectometer, they measured the coefficient of retroreflectivity ($R_A$) for each sign, recording attributes such as sheeting type (Types I, III, III HIP, IX, and XI), color, and installation date. Damage was categorized into six groups: bending/cutting, cracking, fading, peeling, vandalism, and other forms. Statistical analyses, including regression models, chi-square tests, t-tests, and odds ratios, were employed to evaluate the relationship between sign age, damage presence, and retroreflectivity compliance. The findings indicate that sign age is a poor predictor of retroreflectivity, with regression models yielding low $R^2$ values and lacking statistical significance. In contrast, a strong association was found between damage and non-compliance. Specifically, 18% of damaged signs failed to meet MUTCD standards, compared to only 4% of undamaged signs. Among sheeting types, Type III yellow signs showed a statistically significant decrease in retroreflectivity when damaged. When comparing specific damage forms, fading was identified as the most critical factor; signs with fading damage had odds of failure 15.77 times higher than other signs. Other damage types, such as vandalism or peeling, also negatively impacted performance but to a lesser extent than fading. The significance of this research lies in its challenge to the prevailing reliance on sign age for replacement schedules. The results suggest that transportation agencies should incorporate damage assessment, particularly for fading, into their sign management plans. By identifying damage as a primary driver of retroreflectivity loss, agencies can move beyond blanket replacement policies based on expected life, allowing for more targeted and efficient maintenance of traffic sign inventories to ensure driver safety and regulatory compliance.

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Topics

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• sign visibility legibility
• signage environment
• vehicle conspicuity