Motorist Understanding of Traffic Control Devices: Study Results and Recommendations

Hawkins Jr, H Gene; Womack, Katie N.; Mounce, John M. · 1995 · ROSA P / Texas Transportation Institute. Texas A&M University

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Summary

This study, conducted by the Texas Transportation Institute between 1990 and 1994, addresses the critical need to evaluate and improve motorist comprehension of traffic control devices. Recognizing that signs, markings, and signals are primary means of communicating roadway information to drivers, the research aimed to assess driver understanding of existing devices and recommend actions to enhance comprehension where deficiencies were identified. The study sought to promote safer and more uniform traffic operation by ensuring that regulatory, warning, and guide devices effectively convey their intended messages. The researchers evaluated 52 specific traffic control devices, comprising 13 regulatory signs, 18 warning signs, 10 other sign types, 7 pavement markings, and 5 signal indications. Data were collected from 2,414 drivers using five distinct evaluation procedures. The primary method was a statewide survey administered to 1,745 drivers across 12 Texas cities, utilizing a multiple-choice format to assess understanding of 46 devices. Results from this survey informed subsequent follow-up evaluations, which included two surveys conducted at auto shows (totaling 608 participants), a Spanish-language survey of 31 drivers, and three focus groups of 10 drivers each. While the statewide and initial auto show surveys used multiple-choice questions, the later auto show survey and focus groups employed open-ended response formats to gain deeper insights into driver interpretation. The analysis of these evaluations identified specific devices where driver understanding was suboptimal, leading to targeted recommendations for improvement. The findings were categorized into four implementation strategies: no action required, changes to Texas Department of Transportation (TxDOT) practices, enhancements to driver education and training, and the conduct of additional research. Specific recommendations included revisions to the Texas Manual on Uniform Traffic Control Devices, updates to TxDOT signing practices via district memoranda, and modifications to the Texas Drivers Handbook. Furthermore, the study suggested integrating clearer explanations of complex devices into driver education curricula and launching public information campaigns to address persistent comprehension issues. The significance of this research lies in its direct application to traffic safety and infrastructure management. By systematically identifying gaps in driver knowledge, the study provided a evidence-based framework for refining traffic control standards and educational materials. The recommendations aim to reduce confusion and potential hazards associated with misunderstood devices, thereby improving overall roadway safety. The study also established a methodology for ongoing assessment, highlighting the importance of continuous evaluation of traffic control devices to adapt to changing driver populations and infrastructure needs.

Key finding

The study identified specific traffic control devices that demonstrated a potential for improvement in driver understanding, leading to recommendations for changes in design, use, and education.

Methodology

survey

Sample size: 2414

Provenance

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

Topics

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• signage environment
• rail grade crossings
• signaling behavior
• perceptual countermeasures
• sign visibility legibility
• emergency work zone conspicuity