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32 Appendix A Minimum Maintained Retroreflectivity Levels Resources The first document is reprinted here in its entirety because of its importance. This document is referenced in the MUTCD and contains the basic information of the visual inspection method that outlines the three specific procedures that FHWA intends to be used if the visual inspection method is selected. Other valuable sign retroreflectivity resources are included in this Appendix.

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37 Other sign retroreflectivity resources: MUTCD http://mutcd.fhwa.dot.gov/ FHWA Nighttime Visibility Resources http://safety.fhwa.dot.gov/roadway_dept/night_visib/ FHWA Nighttime Visibility Policy Guidance http://safety.fhwa.dot.gov/roadway_dept/night_visib/policy_guide/ FHWA 2011 Traffic Sign Retroreflective Sheeting Identification Guide http://safety.fhwa.dot.gov/roadway_dept/night_visib/sign_visib/sheetguide/ FHWA Rumors, Myths, and the Straight Facts http://www.rocal.com/DOCS/FINAL%20myth%20brochure%20april%2011%20(4).pdf FHWA Presentation: Conducting Sign Retroreflectivity Inspections http://safety.fhwa.dot.gov/roadway_dept/night_visib/sign_visib/pps_signinsp0708/ The National Work Zone Safety Information Clearinghouse http://www.workzonesafety.org/ ATSSA Retroreflectivity Clearinghouse http://www.atssa.com/Retroreflectivity.aspx Washington State DOT Traffic Sign Retroreflectivity website http://www.wsdot.wa.gov/LocalPrograms/Traffic/SignRetro.htm Minnesota DOT resources http://www.dot.state.mn.us/stateaid/trafficsafety/retro-reflectivity/SignRetroreflectivity_AMinnesotaToolkit.pdf http://www.lrrb.org/PDF/2010RIC10.pdf National LTAP and TTAP website http://www.ltap.org/centers/ Utah LTAP Center Software resources http://www2.utahltap.org/software/ Ohio LTAP Center resources http://www.dot.state.oh.us/Divisions/Quality/LTAP/Sign%20Retroreflectivity%20Implementation%20Guide/GSfile5%20 -%20Template%201%20-%20Calibration%20Signs%20Procedure.pdf The Technology Transfer Program, Institute of Transportation Studies at University of CaliforniaBerkeley http://www.techtransfer.berkeley.edu/newsletter/08-1/retroreflectivity.php Center for Technology & Training at the Michigan Tech Transportation Institute http://ctt.mtu.edu/SignRetroPresentations.html