Roadway Lighting Handbook

Walton, Ned E. · 1978 · ROSA P / United States. Department of Transportation. Federal Highway Administration. Office of Research and Development

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Summary

The *Roadway Lighting Handbook* (1978), published by the Federal Highway Administration (FHWA) and authored by the Texas Transportation Institute, addresses the engineering challenge of maintaining safe and efficient mass mobility during nighttime hours. Motivated by the need to provide comprehensive guidance amidst rising energy costs, the document serves as a technical manual for the design, installation, operation, and maintenance of fixed roadway lighting systems. It aims to bridge the gap between theoretical concepts and practical application, assisting engineers in creating lighting environments that improve visibility for drivers, bicyclists, and pedestrians while potentially reducing accidents and crime. The handbook is structured around a systematic process for lighting system development, beginning with an analysis of driver information needs, which are categorized as geometric, operational, and environmental. It details the physiological basis of visibility, explaining concepts such as illumination, luminance, visual acuity, contrast, and glare, while distinguishing between photopic, mesopic, and scotopic vision states relevant to night driving. The text provides specific methodologies for analyzing lighting needs through warranting procedures based on traffic volume and facility characteristics. It further outlines procedures for selecting lighting equipment (light sources and luminaires), determining system configurations (such as median vs. side-mounted systems), and designing the hardware, including electrical distribution and structural supports. The handbook also covers the economic analysis of lighting systems, including cost-effectiveness and value engineering. Key findings and recommendations include the assertion that properly applied roadway lighting can reduce night accidents by approximately 30 percent, though it cannot achieve daytime equivalent rates due to factors like fatigue and intoxication. The FHWA explicitly discourages the use of continuous freeway lighting except where no practical alternative exists, advocating instead for modern delineation systems where feasible, pending further research on optimal applications. The handbook provides specific design criteria, such as recommended average maintained horizontal illumination levels and uniformity ratios, and emphasizes the importance of controlling glare and ensuring adequate pavement brightness to facilitate object discernment by silhouette. It also highlights the multi-purpose nature of local street lighting, which serves not only visibility but also crime deterrence and civic betterment. The significance of this handbook lies in its role as a foundational reference for transportation engineers and public officials, providing a standardized approach to roadway lighting that balances safety, efficiency, and economic constraints. By integrating physiological understanding of vision with practical engineering design procedures, it offers a comprehensive framework for improving nighttime roadway environments. The document underscores the necessity of engineering analysis in selecting between lighting and delineation, reflecting the era’s focus on energy conservation without compromising safety. It remains a critical resource for understanding the technical and operational aspects of public roadway lighting systems.

Key finding

Roadway lighting is intended to reduce night accidents by about 30 percent, though it cannot produce daytime-equivalent accident rates due to modifying factors like fatigue and intoxication.

Methodology

review

Provenance

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Topics

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• roadway lighting effects
• visibility analysis litigation
• emergency work zone conspicuity
• headlamp performance