Examine Dual-Component Pavement Marking Alternatives

The Arizona Department of Transportation (ADOT) uses dual-component pavement marking products (such as epoxy paints) to stripe roadways at elevations of 4,000 feet and higher. These hardened paints withstand abrasion from snowplow blades better than the thermoplastic materials used at lower elevations. However, even the dual-component products need replacement after a single season of snowplowing (although restriping is done every two years due to resource availability). Not only does this two-year life cycle incur repetitive striping costs, but it also exposes ADOT striping crews to traffic hazards. In addition, the composition of available dual-component pavement marking products has changed significantly over the past 15 years, to the extent that the current ADOT specifications (ADOT 709 Spec) have not kept up with advancements in product chemistry. New products are available that meet revised environmental regulations and offer improved performance and application options. The specifications, which were last updated in 2000, do not address these innovations, so contractors and ADOT maintenance crews cannot take advantage of any benefits they offer. Further, the lack of new product performance data prohibits using such striping products on new projects.