Pedestrian Signal Safety for Older Persons

AAA Foundation for Traffic Safety · 2007 · AAA Foundation for Traffic Safety

archive: archived pipeline: cataloged verified

Get this paper ↗ (full text — opens at the source; we link to it, we don't host it)

Summary

This study, commissioned by the AAA Foundation for Traffic Safety, addresses the safety and operational challenges posed by an aging population and the increasing demand for walkable communities. With pedestrians aged 65 and older representing a significant portion of traffic fatalities, the research investigates whether current pedestrian signal timing standards adequately accommodate older walkers. Specifically, the study examines the walking characteristics of older pedestrians, the impact of pedestrian countdown (PCD) signals versus traditional pedestrian signals (TPS), and the trade-offs between extending pedestrian crossing times and increasing vehicular delay. The methodology combined a comprehensive literature review, agency surveys, field observations, pedestrian surveys, and traffic simulation. Researchers conducted observational studies at four intersections in each of six jurisdictions, comparing sites equipped with both TPS and PCD signals. They measured walking speeds, start-up times, and compliance rates for pedestrians under age 65 and those aged 65 and older. Additionally, the team used CORSIM traffic simulation software to analyze how varying pedestrian walking speeds (specifically 3.00, 3.50, and 4.00 feet per second) affected intersection level of service and vehicle delay across different traffic volumes. The findings revealed that older pedestrians walked significantly slower than younger counterparts, with a mean difference of approximately 0.80 feet per second. While PCD signals resulted in slightly faster walking speeds for older pedestrians compared to TPS, the 15th-percentile walking speed for older adults ranged from 3.40 to 4.00 feet per second, often falling below the standard 4.00 feet per second used in signal timing. Consequently, many older pedestrians could not complete crossings within standard intervals. The simulation results indicated that reducing the design walking speed to 3.50 feet per second would cause insignificant to minor increases in vehicular delay at intersections operating at Level of Service A, B, or C. However, at intersections operating at Level of Service D or E, this reduction caused minor to moderate delays, while a speed of 3.00 feet per second caused moderate to major delays. The study concludes that current signal timing standards based on a 4.00 feet per second walking speed fail to accommodate the slowest 15% of older pedestrians. The authors support the National Committee on Uniform Traffic Control Devices’ recommendation to lower the standard walking speed to 3.50 feet per second, noting that this adjustment is feasible with minimal operational impact at most intersections. They further suggest that implementing a 7-second WALK interval alongside clearance times based on 3.50 feet per second would allow older pedestrians to cross safely if they start within three seconds of the signal change. The report highlights that while accommodating slower speeds increases vehicle delay, the impact is manageable in low-to-moderate traffic conditions, offering a viable path to improving pedestrian safety for older adults.

Key finding

Field data and CORSIM simulations support reducing default pedestrian signal walking-speed assumptions from 4.0 to 3.5 ft/sec to better accommodate older pedestrians, with only minor vehicular delay impacts at most intersections operating below capacity.

Methodology

mixed_methods

Provenance

The full processing record for this entry. Every stage of this paper's journey through the pipeline is logged — what ran, with which tool and model, how many attempts it took, and when it last completed. Discovered via bulk_ingest_aaa_foundation on 2026-05-23 (4 acquisition events logged).

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

Topics

Ranked by relevance to this paper. Hover a topic for its definition.

• pedestrian behavior perception
• vru facing ehmi