Contrast markings are used to improve the visibility of pavement markings by providing better contrast with the pavement surface. The use of contrast pavement markings (CPMs) by state departments of transportation (DOTs) has been growing in recent years. However, there is no national consensus on what design to use and when and where to install CPMs. The objective of this synthesis was to document the current practice of CPMs by DOTs.
Information for this study was gathered through a literature review, a survey of state DOTs, and follow-up interviews with selected DOTs. Case examples of four state DOTs provide additional information on the use of CPMs.
Omar Smadi and Neal Hawkins, Iowa State University, collected and synthesized the information and wrote the report. The members of the topic panel are acknowledged on page iv. This synthesis is an immediately useful document that records practices that were acceptable within the limitations of the knowledge available at the time of its preparation. As progress in research and practice continues, new knowledge will be added to that now at hand.
Completed report can be found at NCHRP Synthesis Report 613.