Identification of Hazards Associated with Mobile and Short Duration Work Zones

Ullman, Brooke R.; Finley, Melisa D.; Trout, Nada D. · 2003 · ROSA P / Texas. Department of Transportation

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Summary

This report documents the first year of a two-year research project sponsored by the Texas Department of Transportation (TxDOT) and the Federal Highway Administration, conducted by the Texas Transportation Institute. The study addresses the safety challenges inherent in mobile and short-duration work zones, where the time required to set up standard traffic control devices often exceeds the duration of the work activity itself. The primary objective was to identify potential hazards associated with these operations and determine the underlying causal factors affecting worker and motorist safety. To achieve this, the researchers employed a multi-method approach. First, they conducted a literature review of existing guidelines, including the Manual on Uniform Traffic Control Devices (MUTCD), and previous research on freeway maintenance safety. Second, a survey was distributed to 49 state transportation agencies, yielding responses from 17 states to assess current practices, definitions, and identified hazards. Third, seven focus groups comprising field and supervisory personnel from TxDOT were held to gather insights on safety concerns and generate ideas for improvement. Finally, the team conducted field observations of 11 mobile and 18 short-duration maintenance operations across various Texas districts to document work zone setups and motorist behaviors. The findings revealed significant inconsistencies in how mobile and short-duration operations are defined and classified across different states, complicating the standardization of safety protocols. For instance, definitions varied regarding intermittent stops and maximum work durations. The research identified four primary categories of hazards: motorist behavior, motorist comprehension, worker exposure, and vehicle conflicts. Field observations and focus groups highlighted that the impracticality of installing extensive traffic control for brief tasks leads to simplified setups, which can increase risk if not properly managed. The study also noted that while most states have standard plans compliant with the MUTCD, practices vary significantly regarding the use of shadow vehicles, arrow panels, and specific device configurations based on roadway speed and traffic volume. The significance of this research lies in its identification of the need for tailored strategies and technologies to improve safety in these specific work zone types. By documenting the discrepancies in definitions and the specific hazards encountered, the report provides a foundation for the second year of the project, which aims to evaluate new traffic control devices and strategies. The findings underscore that safety should not be compromised by reducing device counts solely for efficiency, suggesting that alternative measures, such as enhanced vehicle lighting or dynamic message signs, may be necessary to mitigate risks associated with mobile and short-duration maintenance.

Key finding

The primary categories of hazards identified were motorist behavior, motorist comprehension, worker exposure, and vehicle conflicts, while definitions of mobile and short duration operations were found to be inconsistent.

Methodology

mixed_methods

Sample size: 29

Provenance

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

Topics

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• work zones
• emergency work zone conspicuity