Identification of Traffic Control Problems on Urban Arterial Work Zones

Tsyganov, Alexei; Machemehl, Randy; Liapi, Katherine · 2003 · ROSA P / Texas. Department of Transportation

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Summary

This study addresses the safety and operational challenges associated with traffic control in work zones on urban arterial streets in Texas. Rapid industrial development and population growth have overloaded the state’s highway network, necessitating frequent maintenance and improvement projects. These work zones significantly alter traffic operations and increase accident risks. The research was motivated by the need to identify specific traffic control problems, characterize their causes, and develop improved treatments to enhance safety for both motorists and workers. A key issue identified is that current traffic control plans often combine numerous devices to meet various standards, creating visual overload and confusion for drivers, particularly in urban environments characterized by high visual noise and complex geometries. The researchers employed a multi-method approach to identify and classify existing traffic control problems. First, an extended literature review analyzed work zone accident statistics to determine frequent accident types and contributing factors. Second, field observations were conducted at work zones on urban arterial streets in the Austin, San Antonio, and Houston metropolitan areas. These observations documented specific issues such as damaged devices, improper placement, and inadequate buffering. Third, a questionnaire survey was administered to Texas Department of Transportation (TxDOT) personnel involved in traffic control design and inspection to gather professional insights on problem frequency and causes. The findings from these methods were compared against current design standards, including the Manual on Uniform Traffic Control Devices (MUTCD). The study identified several critical traffic control problems, including insufficient buffer spaces, damaged or improperly installed signs and barricades, excessive visual noise from commercial signage, and inadequate protection when construction equipment is in close proximity to traffic. Based on these findings, the researchers developed recommendations for improving urban arterial work zone traffic control plans. These recommendations focus on signing, marking, and other devices better suited to drivers’ abilities and behavior. The report includes draft guidelines for the placement and design of traffic control devices, addressing specific scenarios such as lane closures, intersections, and transitions. Additionally, the study produced the first version of typical traffic control plans and proposed amendments to the MUTCD to better address the unique challenges of urban arterial work zones. The significance of this research lies in its contribution to systematic improvements in work zone safety. By moving beyond isolated device requirements to a system perspective, the study provides TxDOT and other agencies with practical tools to reduce confusion and accidents in urban work zones. The developed guidelines and typical plans offer a standardized approach to traffic control design, aiming to mitigate the risks associated with visual overload and complex urban geometries. This work supports the broader goal of enhancing transportation safety during necessary infrastructure improvements, ensuring that traffic control measures are effective, clear, and responsive to driver behavior.

Key finding

Field observations and personnel surveys identified that excessive visual noise and poorly designed traffic control devices in urban work zones create driver confusion and safety risks, necessitating revised guidelines for device placement and design.

Methodology

field_study

Provenance

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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.

• work zones
• emergency work zone conspicuity
• signage environment
• perceptual countermeasures
• rail grade crossings