Older Pedestrian Characteristics for Use in Highway Design

Knoblauch, Richard; Nitzburg, Marsha; Dewar, Robert; Templer, John A.; Pietrucha, M. T. · 1995 · ROSA P / United States. Department of Transportation. Federal Highway Administration

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Summary

This report addresses the critical need for highway design standards that accommodate older pedestrians, a demographic with the highest pedestrian fatality rate of any age group. While research on older drivers is extensive, the physical, sensory, and cognitive characteristics of older pedestrians have been largely overlooked, despite the growing proportion of individuals over age 65 in the North American population. The study aims to identify specific difficulties older pedestrians face in the traffic environment and to develop evidence-based guidelines for traffic planners and engineers to improve safety and accessibility. The research employed a multi-phase methodology. First, a detailed task analysis and literature review identified motor, sensory, perceptual, cognitive, and behavioral factors affecting pedestrian movement. Second, problem identification activities included analyzing accident exposure data, conducting surveys of older pedestrians through the American Association of Retired Persons (AARP) and *Walking* magazine, holding focus group discussions, and surveying transportation practitioners. Third, a large-scale field study observed more than 7,000 pedestrians across four cities to quantify walking speed, startup time (the delay before beginning to cross after a signal change), and stride length. These empirical measurements were compared against existing data from the Institute of Traffic Engineers. The findings reveal that older pedestrians experience significant difficulties at signalized intersections, primarily due to insufficient crossing time. The field study provided specific quantitative data on walking speeds and startup times, demonstrating that age-related declines in visual perception, reaction time, and motor abilities compound these challenges. Older pedestrians often lack the time to cross safely before traffic signals change and vehicles begin moving again. The analysis highlighted that these issues stem from a combination of slower walking speeds and delayed response to signal changes, rather than either factor alone. Additionally, the study identified specific visual impairments, such as reduced contrast sensitivity and glare recovery, that hinder safe navigation. Based on these results, the report provides specific recommendations for modifying highway design standards and operational practices. It proposes changes to existing guidelines, including the AASHTO *Policy on the Geometric Design of Highways and Streets*, the *Manual on Uniform Traffic Control Devices*, and the *Manual of Traffic Signal Design*. The recommendations focus on adjusting signal timing and design parameters to reflect the measured capabilities of older pedestrians, thereby reducing accident risks and improving the functionality of the highway system for this vulnerable population.

Key finding

Older pedestrians experience significant difficulties at signalized intersections because age-related declines in perception, response time, and motor abilities result in slower walking speeds and longer startup times that often prevent them from crossing before the signal changes.

Methodology

field_study

Sample size: 7000

Provenance

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

Topics

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• child pedestrian