Pedestrian Safety: The Identification of Precipitating Factors and Possible Countermeasures. Volume 1

Snyder, Monroe B.; Knoblauch, Richard L. · 1971 · ROSA P / United States. National Highway Traffic Safety Administration

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Summary

This 1971 report by Operations Research, Inc., commissioned by the National Highway Traffic Safety Administration, addresses the urgent need to identify the immediate causes of pedestrian accidents and develop effective countermeasures. Motivated by the high incidence of pedestrian fatalities—approximately 10,000 deaths annually, with a disproportionate impact on children in urban areas—the study sought to move beyond descriptive statistics to understand the specific behavioral and environmental factors precipitating crashes. The research focused exclusively on urban environments, where 85% of pedestrian accidents occur, aiming to provide actionable data for local decision-makers to reduce injuries and deaths. The methodology involved collecting behavioral and descriptive data from a sample of 2,157 pedestrian accidents across 13 major U.S. cities between late 1969 and mid-1970. Data were gathered through on-scene observations, interviews with participants and witnesses, and police records. The analysis relied on a conceptual model of the behavioral sequence preceding a crash, emphasizing rigorous causal attribution based on direct evidence rather than mere correlation. Cases were classified into specific accident types based on precipitating events, predisposing factors, and target groups to facilitate the identification of targeted countermeasures. The study identified five primary accident types accounting for over 50% of the sample. These include "Dart-Outs" (pedestrians suddenly appearing from roadside obstructions, such as parked cars), "Intersection Dashes" (pedestrians running across intersections), "Multiple Threat" situations (pedestrians obscured by stopped vehicles), and "Vehicle Turn/Merge with Attention Conflict" (drivers distracted by traffic gaps). Specific countermeasures were proposed for each type. For dart-outs, the report recommends "street parking redeployment," involving the removal of parallel parking on one side and installing diagonal parking on the other to improve visibility and physically guide pedestrians. For intersection dashes, it suggests signal retiming to reduce pedestrian waiting periods and the installation of countdown signals. For multiple threat accidents, it proposes extending stop lines further back from crosswalks and implementing ordinances requiring drivers yielding to pedestrians to signal approaching traffic. The significance of this work lies in its shift from general safety advice to specific, causally-based interventions. The report concludes that applying these targeted countermeasures could significantly reduce the estimated 150,000 annual accidents associated with the five major types. It emphasizes that while federal standards are useful, the primary responsibility for implementation lies with local authorities. The study recommends that cities systematically identify local accident patterns, evaluate the cost-effectiveness of specific countermeasures, and monitor their impact to achieve measurable reductions in pedestrian fatalities.

Key finding

The five most frequent accident types, including dart-outs and intersection dashes, accounted for over 50% of the studied pedestrian accidents, with specific countermeasures like street parking redeployment and signal retiming identified as promising solutions for immediate reduction.

Methodology

on_road

Sample size: 2157

Provenance

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

Topics

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• pedestrian behavior perception
• pedal misapplication
• pre crash contributing factors
• child pedestrian
• vru crash typology
• 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).

• Empirical Findings: crash risk outcomes