Older driver highway design handbook

Staplin, L.; Lococo, K.; Byington, S. · 1998 · ROSA P / United States. Joint Program Office for Intelligent Transportation Systems

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Summary

This document, the *Older Driver Highway Design Handbook* (FHWA-RD-97-135), addresses the growing safety challenges posed by the increasing proportion of drivers aged 65 and older. Motivated by demographic projections indicating that older adults will constitute roughly one-fifth of the driving population by 2020, the handbook aims to bridge the gap between known age-related declines in perceptual, cognitive, and psychomotor performance and practical highway design standards. The primary objective is to provide transportation engineers with actionable recommendations to enhance system safety and operational efficiency for normally aging drivers, who experience diminished vision, slowed reaction times, and reduced ability to divide attention. The handbook was developed through a rigorous process involving literature reviews, research syntheses using meta-analytic techniques, and a user-requirements analysis. Feedback was gathered from 94 practitioners across five national committees, including AASHTO and the Transportation Research Board, to identify priority issues. Draft recommendations were subsequently reviewed by a panel of 22 state and local practicing engineers who applied the guidelines to real-world case studies. The final document supplements existing standards rather than replacing them, focusing on four specific roadway feature classes identified as most problematic for older drivers: at-grade intersections, interchanges (grade separation), roadway curvature and passing zones, and construction/work zones. The handbook provides detailed design recommendations for specific elements within these categories, supported by rationale and evidence. For intersections, which account for the majority of fatal accidents among drivers over 80, recommendations cover intersecting angles, channelization, sight distance, left-turn lane geometry, and traffic signal performance. Evidence cited includes field studies prioritized over laboratory simulations, highlighting that older drivers struggle with complex speed-distance judgments and left-turn maneuvers during permitted signal phases. The document emphasizes features such as improved lighting, clear pavement markings, and protected left-turn phases to mitigate these difficulties. It explicitly excludes drivers with dementia, focusing instead on the functional deficits of normal aging. The significance of this work lies in its practical application for highway designers and safety specialists. By linking specific human factors limitations to geometric and operational design elements, the handbook offers a "problem solver" approach for accident sites and a preemptive guide for jurisdictions with high older driver populations. The recommendations are intended to be applied at the discretion of practitioners, balancing safety improvements with cost-effectiveness and current material capabilities. Ultimately, the handbook seeks to enhance the safety and ease of use of the highway system for older drivers, thereby benefiting the entire driving population as demographics shift.

Key finding

The handbook provides specific design recommendations for intersections, interchanges, curvature, and work zones to mitigate the increased accident risks and operational difficulties experienced by older drivers due to age-related functional declines.

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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• road geometry
• perceptual countermeasures
• older drivers
• older driver retraining
• rail grade crossings

Information type

What kind of knowledge this paper contributes, grouped by family — independent of topic (what it is about) and method (how it was studied).

• Applied Guidance: design guidelines
• Methodological Resource: dataset resource