United States Department of Transportation
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Edition:Final Report (April 2014-Dec 2018)
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Abstract:Pavement markings provide an important means of communication for all roadway users and must be capable of conveying information during inclement weather and evening hours when there may be little to no contribution from overhead lighting. The following report outlines the observations relating to five different liquid binder packages, two optic categories and two applications. In addition, the report contains information pertaining to field data collection to assess the comparison of reflective properties and binder presence over time. The Pavement Marking Comparison Study extends from mile marker 52.49 in Montpelier to mile marker 36.93 in Brookfield on Interstate 89. There are 36 test sites, each of which are 400 feet in length. Test sites were specifically chosen in different binder and optics package sections to demonstrate the effectiveness of the binder and optics mixes. Prior to the applications of the markings, sections of the test deck were recessed. The recessed depths were recorded throughout the project. In addition, each test site contains retroreflectivity readings and visibility wear comparisons from both white edge line and yellow edge line markings in 20 feet intervals within each test site using standard methods. Retroreflectivity readings were taken with a RoadVista Stripemaster 2 Touch. Readings were collected on Day 1 (August 2014) then once every week for the first month. After the first month of weekly readings, monthly readings were taken. After 6 months, readings were taken seasonally, and then again after a period of two years. In the December 2014 site visit (after the first snow event), there was significant loss of binder and optics in the thermoplastic test sections. During the same visit, waterborne pavement markings had significant loss of binder and optics. Recessing the pavement markings provides a noticeable improvement over surface applied markings. The two best performing markings were Polyurea and Epoxy, in that order. Wet Reflective elements provided similar dry retroreflectivity compared to the Utah Blend, except that higher initial values often reduced quickly.
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