Evaluation of Alternatives to Provide Wet-Nighttime Delineation

Kenneth Agent
2016 unpublished
We provide services to the transportation community through research, technology transfer, and education. We create and participate in partnerships to promote safe and effective transportation systems. Type of Report and Period Covered Final Sponsoring Agency Code Supplementary Notes Abstract The objective of this study was to compare the performance of various types of materials, devices, and procedures that can potentially delineate roadways during wet, nighttime conditions. Snowplowable
more » ... . Snowplowable markers provide the most effective wet-nighttime delineation. Durability issues associated with the steel casting marker make the recessed marker preferable over the life of the pavement. Wet reflective tape placed in a groove provided both dry and wet-nighttime delineation and remained durable. The performance of thermoplastic material installed on the pavement surface supports its future use but will not provide wet-nighttime delineation. Inconsistent performance of inlaid tape argues against its expanded use. Poor performance shows that future use of wet-reflective tape should not be considered. The research indicates an effective lane delineation procedure for four lane roads would include: recessed markers on lane lines (at 80-foot centers), grooved wet-reflective tape for lane lines, and spray thermoplastic for the edge lines. A cost analysis, considering durability of the materials, show that the cost of using more durable materials over the life of the pavement is not dramatically more than the cost of traffic paint. Edge line rumble stripes and centerline rumble strips enhance wet-nighttime delineation and should be incorporated into resurfacing projects on two-lane roads where pavement width permits. Key Words snowplowable pavement marker, thermoplastic material, wet reflective tape, rumble stripes, recessed marker, wet reflective paint Distribution Statement