Improving the Safety of Moving Lane Closures

Steele, Douglas A.; Vavrik, William R. · 2009 · ROSA P / Illinois Center for Transportation

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Summary

This study addresses the inherent safety hazards of moving lane closures, a traffic control procedure increasingly used for highway maintenance to minimize disruption. The research was motivated by the high risk of accidents in these dynamic work zones, where motorists often fail to recognize the closure or respond with appropriate care, leading to collisions with traffic control vehicles or incursions into the work area. The primary goal was to identify modifications to current practices that would improve safety for both workers and the traveling public by influencing driver behavior to slow down, vacate closed lanes early, and remain in open lanes until safely past the work zone. The methodology involved full-scale field experiments conducted at four locations in Illinois, representing diverse conditions: three high-volume urban sites (including daytime and nighttime operations) and one rural interstate site. Researchers utilized videotaping from bridges and work vehicles, along with speed monitoring by the Illinois State Police, to document driver behavior. The study analyzed various traffic control components, including the number, configuration, and spacing of shadow vehicles (specifically Truck-Mounted Attenuators or TMAs), the use of lead trucks, advance warning messages, and the presence of law enforcement. Additionally, the researchers performed a rollahead distance analysis to determine how far TMAs would displace if struck by vehicles of varying sizes and speeds. Key findings revealed significant differences in driver behavior between urban and rural settings. Urban drivers exhibited more aggressive behavior, approaching work zones closer and reentering closed lanes sooner (peak cut-in distance of 100 ft) compared to rural drivers (peak cut-in of 225 ft). The study found that adding a highly visible "lead truck" downstream of the work area effectively extended the perceived work zone length, preventing lane incursions that occurred when drivers believed they had passed the closure. Police presence significantly reduced vehicle speeds and increased the distance at which drivers vacated the closed lane; for instance, on I-88, police presence reduced the percentage of vehicles approaching within 500 ft from 5.6% to 0.7%. Conversely, congestion in urban areas led to hazardous late merging, with many vehicles stopping directly behind TMAs. The rollahead analysis highlighted that large trucks traveling at highway speeds could displace a TMA several hundred feet, endangering workers positioned nearby. The significance of this research lies in its evidence-based recommendations for revising traffic control standards. The study concludes that current standards do not adequately distinguish between urban and rural settings or account for the specific hazards of moving closures. It suggests that incorporating lead trucks, buffer trucks, and police presence can mitigate risks. Furthermore, the findings underscore the need for future research to develop specific guidelines for moving lane closures, addressing issues such as nighttime visibility, public perception of maintenance zones versus construction zones, and the balance between worker safety and traffic mobility. The report serves as Phase I of a larger effort to enhance the safety protocols for highway maintenance operations.

Key finding

Police presence reduced vehicle speeds by 10 to 15 mph and decreased the percentage of vehicles approaching the work zone closely by up to 85 percent, while adding a lead truck downstream prevented incursions into the work area for lengths up to 200 feet.

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
• perceptual countermeasures