Public Roads: A Journal of Highway Research and Development, Vol. 56 No. 1

Pisano, Paul; Walker, Jonathan; Alicandri, Elizabeth; Sedney, Catherine A.; Roberts, King; Pagan-Ortiz, Jorge E.; Black, Kevin N.; Kenis, William · 1992 · ROSA P / United States. Government Printing Office

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Summary

This paper presents findings from two distinct studies conducted by the Federal Highway Administration (FHWA) regarding highway safety and driver performance. The first study, by Paul A. Pisano, addresses the lack of standardized methodology for testing new traffic control signs. Previously, sign testing varied in methods and relied on a self-selected volunteer pool from the Turner-Fairbank Highway Research Center (TFHRC), raising concerns about validity and efficiency. The second study, by Walker et al., examines the safety implications of using in-vehicle navigational devices, specifically how varying levels of device complexity and driving workload affect driver performance. Pisano’s study developed a standard testing methodology focusing on two measures of effectiveness: comprehension (correctness of response) and recognition (response time). Conspicuity was excluded due to measurement difficulties in a laboratory setting. The experimental apparatus consisted of a portable cart with slide projectors, a timer, and a rear-projection screen, allowing for compact and efficient data collection. To validate the TFHRC subject pool, Pisano compared its results against a non-self-selected group recruited from the Department of Motor Vehicles (DMV). The study tested 18 signs for recognition and 15 for comprehension using subjects aged 18–25 and 65+. Statistical analyses, including Chi-square and Kolmogorov-Smirnov tests, revealed no significant differences in response correctness or response times between the TFHRC and DMV groups. Consequently, the study concluded that the TFHRC volunteer pool is a valid representative sample for sign testing and that the proposed standardized methodology is efficient and reliable. Walker et al. investigated driver performance using the FHWA Highway Simulator. The study involved 126 licensed drivers across three age groups (20–25, 35–40, and 55+) balanced by gender. Participants were assigned to one of seven conditions: three visual guidance units (complex map, medium block-count, simple arrow), three corresponding audio units, and a control group using strip maps. The simulation scenario incorporated increasing levels of psychomotor, perceptual, and cognitive loading to simulate difficult driving conditions. Data collected included heart rate, reaction time to gauge changes, vehicle speed, and lateral placement deviations. The study aimed to determine if the additional cognitive and perceptual demands of operating navigational devices caused unacceptable deteriorations in driving safety, particularly under high-workload conditions. The significance of these findings lies in establishing rigorous, standardized protocols for highway research. Pisano’s work validates existing FHWA testing practices and provides a cost-effective framework for other agencies to evaluate traffic signs. Walker et al.’s study contributes to the understanding of human factors in vehicle technology, providing empirical data on how in-vehicle navigation systems impact driver behavior and safety under varying stress conditions. Together, these studies support the development of safer highway infrastructure and more effective vehicle interface designs.

Key finding

There was no statistically significant difference in sign comprehension or recognition times between self-selected volunteers and a non-self-selected Department of Motor Vehicles subject pool.

Methodology

mixed_methods

Sample size: 126

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_rosap on 2026-05-23 (6 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.

• perceptual countermeasures
• rail grade crossings
• signage environment
• work zones
• visual occlusion
• speed choice

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: behavioral performance data
• Methodological Resource: validation psychometrics, dataset resource