Pavement Markings - Wet Retroreflectivity StandardsStatus: CompleteReport Date: 04/14/2020 Summary: Reflective pavement markings, especially centerline and edge lines, give drivers a continuous stream of information about the size and location of the vehicle lane. Markings need to be visible during the day, at night and in both dry and wet conditions. Wet-night conditions reduce the retroreflectivity of pavement markings considerably, increasing the risk of run-off-road crashes. Better materials for pavement markings have been developed, but drivers' visibility needs and new pavement marking effectiveness have not been definitively determined. This project considered previous research and conducted its own human factors research with 43 participants on a closed test track to learn about driver visibility needs, as well as the minimum level of pavement marking retroreflectivity that would meet those needs. MnDOT will use the results to create new specifications. Final Deliverables: Pavement Markings - Wet Retroreflectivity Standards (Report #2020-09) Identifying Wet Retroreflectivity Levels for Pavement Markings (Research Summary) Related Materials: 3M Technology Talk: Setting a Wet Reflective Pavement Marking Specification (Video/Webinar) Wetreflective Pavement Markings Can Help Prevent Crashes (News/Publication Article) 3M Technology Talk: Improve Road Safety with Wet Reflective Pavement Marking (Video/Webinar) Related Research: Assessing Pavement Markings for Automated Vehicle Readiness Project Personnel: Principal Investigator: Adam Pike Technical Liaison: Ethan Peterson Project Coordinator: Brent Rusco Panel Members: Allen Gallistel - Materials & Road Research Bradley Lechtenberg - Maintenance Bruce Daniel - Maintenance Christopher Cochran - Traffic Engineering David Meslow - 3M Company Ethan Peterson - Traffic Engineering Jeffrey Rieder - District 6 Kate Miner - Stonebrooke Engineering Kevin Goforth - Potters Industries Luke Johanneck - Construction & Innovative Contracting Michael Ehlert - Maintenance Mitchell Bartelt - Metro District Sheila Johnson - Maintenance Tiffany Kautz - Traffic Engineering Tom Hedblom - 3M Company Victor Lund - St. Louis County Public Works - Engineer