Evaluation of Steady-Burn Warning Lights on Channelizing Drums in Work Zones

Datta, Tapan K.; Gates, Timothy J.; Savolainen, Peter T.; Nannapaneni, Prasad · 2010 · ROSA P / Michigan. Dept. of Transportation

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Summary

This study evaluates the safety, mobility, and cost implications of using steady-burn warning lights on channelizing drums in construction work zones, motivated by the Michigan Department of Transportation’s (MDOT) policy change to discontinue their use. The research aims to determine if the elimination of these lights negatively impacts driver safety or visibility, or if the associated costs outweigh any potential benefits. The methodology combined crash data analysis, field studies of driver behavior, luminance measurements, and cost assessments. Researchers compared national crash data across states with varying policies regarding steady-burn lights and conducted an in-depth analysis of Michigan work zone crashes. Field studies observed 1,236 vehicles in 28 work zones to assess driver behavior, including lateral placement, steering reversals, and speed. Luminance was measured in both controlled environments and real-world field settings using a Konica/Minolta LS-100 meter, comparing drums with high-intensity and prismatic sheeting, with and without lights. Finally, a cost analysis examined material, installation, maintenance, and disposal expenses. The findings indicate that steady-burn warning lights provide minimal safety or visibility benefits. Crash data showed no substantive difference in safety outcomes between work zones with and without lights, and older drivers were not disproportionately affected. Driver behavior studies revealed that while lateral placement was largely unaffected, drivers in zones with lights exhibited significantly higher rates of steering reversals and slightly higher speeds, suggesting potential distraction or reduced caution. Luminance tests demonstrated that lights increased brightness by only 2.6% to 7.3%, whereas upgrading from high-intensity to prismatic sheeting increased luminance by over 177%. Crucially, all measured luminance levels exceeded recommended visibility minimums regardless of light presence. Cost analysis revealed that drums with lights cost 130% more per unit and added $5,744 to $7,157 per mile in annual material and maintenance costs. The study concludes that steady-burn warning lights on channelizing drums do not deliver sufficient safety benefits to justify their significant tangible and intangible costs. Since drums without lights already meet visibility standards and do not increase crash rates, the research supports MDOT’s decision to eliminate their use. The findings suggest that resources are better allocated toward maintaining drum condition and using higher-quality retroreflective sheeting rather than installing active lighting systems.

Key finding

Steady-burn warning lights on channelizing drums provide negligible luminance improvements and do not reduce work zone crashes, while incurring significant costs and potentially increasing driver steering reversals and speeds.

Methodology

mixed_methods

Sample size: 1236

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
• roadway lighting effects
• work zones
• perceptual countermeasures