Safety and Environmental Design Consideration in the Use of Commercial Electronic Variable-Message Signage

Wachtel, Jerry; Netherton, Ross · 1980 · ROSA P / United States. Department of Transportation. Federal Highway Administration. Office of Research

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Summary

This 1980 report by the Federal Highway Administration (FHWA) addresses the safety, environmental, and economic implications of Commercial Electronic Variable-Message Signage (CEVMS) along Interstate highways. The study was motivated by the 1978 amendments to the Highway Beautification Act, which permitted electronic signs displaying public service information or on-premise advertising, provided messages changed at reasonable intervals. The FHWA sought to evaluate existing research and operational experience to inform the development of national standards that would minimize adverse impacts on highway safety, visual aesthetics, and public highway investment. The methodology involved a comprehensive review of reported research, legislative history, and operational data regarding CEVMS and outdoor advertising. The authors categorized CEVMS into four primary technological types: alternating time-and-temperature displays, multiple message center signs, automated reader board signs, and advanced optical shutter systems like "ONEX." The analysis drew upon accident data studies, human factors research concerning driver distraction and attentional capacity, and assessments of visual quality and highway infrastructure costs. The report also examined the regulatory framework and the specific characteristics of CEVMS, such as message duration, brightness, and animation, to determine their potential risks. The findings indicate that accident data studies alone are insufficient for establishing safety standards due to statistical deficiencies and the inability to capture "near misses." However, human factors research suggests that while CEVMS may have minimal impact under low driving task demands, they pose significant risks under high-demand conditions. Because driver attentional capacity is finite, CEVMS with high attention-getting properties can distract drivers from primary vehicular control tasks, potentially leading to errors. Regarding aesthetics, the report notes that while manufacturers claim CEVMS reduce sign clutter, these benefits are unproven, and such signs risk visual incompatibility with natural environments. Furthermore, the report identifies risks to highway investment, including the unauthorized removal of vegetation to improve sign visibility and the potential for premature functional obsolescence of highways due to changing roadside land values. The significance of this report lies in its identification of specific CEVMS characteristics that require regulatory control, including longitudinal and lateral location, spacing, message duration, intensity changes, and maintenance requirements. The authors conclude that current knowledge is insufficient to support quantified standards and recommend further well-designed research to validate policy decisions. The report serves as a foundational document for developing regulations that balance commercial advertising interests with the public interest in safety, environmental quality, and the preservation of highway infrastructure.

Key finding

Human factors research indicates that CEVMS with high attention-getting properties may distract drivers from primary tasks under high attentional demand conditions, although accident data remains statistically insufficient to scientifically support a direct relationship with accidents.

Methodology

review

Provenance

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

Topics

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• external distraction
• signage environment
• sign visibility legibility
• ehmi external hmi
• vru facing ehmi
• roadway lighting effects

Information type

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• Applied Guidance: design guidelines