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Evaluation of inlaid durable pavement markings in an Oregon snow zone.
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    The Oregon Department of Transportation (ODOT) evaluated the use of inlaid durable pavement markings within a snow zone. Three different durable pavement marking products were installed and evaluated: Dura-Stripe®, a methyl methacrylate; Permaline®, an alkyd based thermoplastic; and, 3M™ Stamark™ Series 380I Tape, a preformed tape. Each product was applied, at various thicknesses, into a 4 in. (102 mm) wide slot ground to various depths. The slot depths were: 250, 180 and 125 mil (6.35, 4.57 and 3.18 mm). The material thickness was varied to achieve a recess from the surface of the pavement of 30 and 60 mil (0.76 and 1.52 mm) below the surface and 10 mil (0.25 mm) above the surface of the pavement. Some sections of the test deck were installed using ODOT’s existing specification of a 250 mil (6.35 mm) deep slot completely filled with material and top coated with reflective beads. After each winter maintenance season the test sections were evaluated based on durability and retroreflectivity. This report summarizes the performance of the test sections after two years in-service. Recommendations about the future use of inlaid durable pavement markings in snow zones are made, including slot and material depth, and material type. A proposed standard for inlaid durable pavement markings is also presented.

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