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With new federal minimum pavement marking retroreflectivity requirements looming on the horizon, the South Carolina Department of Transportation initiated a research project to develop a systematic methodology to quantitatively evaluate pavement marking materials used on South Carolina's interstate highways. The project began with a number of objectives--all of which were accomplished. These included conducting a literature review of previous work, surveying state departments of transportation concerning their pavement marking practices, comparing different devices for collecting retroreflectivity data, and developing models that could predict the degradation of retroreflectivity over time. This report documents the work conducted on this project.