Wet-reflective pavement marking demonstration project.

Hawkins, Neal; Smadi, Omar; Aldemir-Bektas, Basak · 2011 · ROSA P / Iowa State University. Institute for Transportation

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Summary

This study addresses the critical safety issue of reduced pavement marking visibility under wet night conditions, a leading cause of driver dissatisfaction and fatigue. The research aimed to evaluate the performance of 16 different wet-reflective pavement marking materials and treatments over a two-year period in Iowa. The primary objective was to provide the Iowa Department of Transportation (DOT) and local agencies with empirical data to determine the effectiveness, durability, and cost-efficiency of these products, thereby improving roadway safety and asset management strategies. The methodology involved the installation of a two-year, long-line test deck on US Highway 30 near Ames, Iowa. The test deck consisted of 16 sections, each approximately 2,500 feet long, divided into 2,000 feet of grooved surface and 500 feet of surface-applied treatment. The materials tested included a wide variety of technologies such as Methyl Methacrylate (MMA), thermoplastic, epoxy, waterborne paint, hybridized epoxy, polyurea, and tape, applied on both asphalt and concrete surfaces. Performance was measured using dry and wet retroreflectivity, durability, and presence. Dry retroreflectivity was sampled continuously using a handheld LTL-X retroreflectometer, while wet retroreflectivity was measured using a custom-built rain box adhering to ASTM WK19806 specifications. Data collection occurred at regular intervals from September 2009 through May 2011, capturing performance after initial installation, one winter, and two winters. The results indicated that winter maintenance operations, particularly snow plowing, were the primary source of pavement marking damage. Grooved markings consistently outperformed surface-applied markings in retaining retroreflectivity. After two winters, average dry retroreflectivity for yellow edge lines dropped from an initial range of 268–1,289 mcd to 131–512 mcd. Grooved sections experienced an average loss of 49% in dry retroreflectivity after two winters, compared to 59% for surface-applied sections. Wet retroreflectivity performance varied significantly; initially, only seven of 16 yellow edge line sections exceeded 100 mcd, dropping to just two sections after two winters. White skip lines showed better initial wet performance, with 13 sections exceeding 100 mcd, but only one section remained above this threshold after two winters. Several products, including 3M tape and thermoplastic on concrete, suffered significant material loss or complete failure after the first winter. The study concludes that while wet-reflective technologies offer potential benefits, their durability in Iowa’s harsh winter conditions is a significant challenge. Grooved installation methods provide superior longevity compared to surface applications. The documented performance data serves as a critical resource for transportation agencies to make informed decisions regarding the selection and application of pavement marking materials, balancing visibility improvements with maintenance costs and durability requirements.

Key finding

Grooved pavement markings performed better than surface-applied markings overall through Iowa winters, while paint products showed significant material loss after two winters.

Methodology

field_study

Sample size: 16

Provenance

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

Topics

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• vehicle conspicuity
• signage environment