Improved business driveway delineation in urban work zones.

Theiss, LuAnn; Swindell, Steven; Gillette, II, George F.; Ullman, Gerald L. · 2015 · ROSA P / Texas A&M Transportation Institute

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Summary

This research addresses the safety and operational challenges associated with business driveway delineation in confined urban work zones, particularly during nighttime conditions. In Texas, approximately 38% of work zone crashes occur on non-freeway urban facilities, with rear-end collisions being the most common. Drivers often struggle to identify driveway openings amidst standard channelizing devices like drums, leading to erratic maneuvers such as stopping in travel lanes or making sharp turns without signaling. The study aimed to evaluate alternative channelizing treatments—specifically combinations of 18-inch tall low-profile longitudinal channelizing devices (LCDs) and 42-inch tall cones—against the standard drum treatment to determine if they improve driver detection and safety. The project employed a two-phase methodology. First, a closed-course study identified promising delineation alternatives by evaluating various device configurations, including different drum spacings and LCD heights. Researchers determined that LCDs taller than 21 inches obstructed vertical sight distance for drivers exiting driveways, leading to the selection of 18-inch LCDs for further testing. Second, a human factors field study was conducted in real work zones in McKinney and Houston. Paid participants drove instrumented vehicles equipped with eye-tracking technology while approaching driveways marked with the alternative treatments or standard drums. The study measured effectiveness through driver visual attention (glance times), detection distance, percentage of missed driveways, perception/recall of treatments, and driver preferences. The results indicated that alternative channelizing treatments generally outperformed standard drums, particularly during nighttime conditions. While differences in measures of effectiveness were less pronounced during the day, the alternative treatments provided superior performance at night. The eye-tracking data revealed that drivers allocated more visual attention to the alternative treatments, which helped them locate driveways more effectively. The use of different device types for driveways compared to main lanes provided a visual contrast that aided in driveway detection. Additionally, the 18-inch height of the LCDs ensured adequate sight distance for exiting drivers, addressing a key limitation of taller devices. The significance of this research lies in its potential to improve work zone safety and mobility by enhancing the conspicuity of business driveways. The findings suggest that using low-profile LCDs and cones can reduce driver confusion and erratic behaviors associated with poor delineation. By providing clearer visual guidance, especially at night, these alternative treatments can help drivers identify turning gaps earlier and more accurately. The study supports the adoption of these strategies in urban work zones to mitigate crash risks and improve traffic flow, offering a practical solution to a widespread issue in transportation infrastructure management.

Key finding

Alternative channelizing treatments using combinations of 18-inch low-profile longitudinal channelizing devices and 42-inch tall cones generally performed better than standard drum treatments at night.

Methodology

field_study

Provenance

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

Topics

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• emergency work zone conspicuity
• perceptual countermeasures
• work zones
• signage environment
• roadway lighting effects
• sign visibility legibility