Introduction -- Retroreflectivity standards -- Sign sheeting materials survey -- Minimum retroreflectivity requirements -- Summary and recommendations -- References -- Appendix I: Traffic sign sheeting materials survey -- Appendix II: Comparison of standard retroreflectivity requirements.

Combined state studies: Arkansas State Highway and Transportation Dept., Florida Dept. of Transportation, Kentucky Dept. of Transportation, and Federal Highway Administration.

This study examined deterioration of reflective sign sheeting in New York State, and assessed the effectiveness of sign washing and clear-coating for restoring or preserving reflectivity of enclosed-lens engineer-grade sheeting.

This synthesis will be of interest to traffic engineers, planners, and others interested in making sure that motorists' needs for directional information on freeways are being met. Information is provided on policies and procedures used by states in evaluating freeway guide signs and replacing those that are outdated or deteriorated. Many signs on freeways and other controlled-access highways have exceeded their service life and are no longer serving motorists' needs. This report of the Transportation Research Board describes the policies, proceduress, and criteria used by states for freeway sign evaluation and replacement programs.

NCHRP synthesis 371 explores the state of the practice for managing transportation infrastructure assets other than pavements and bridges, and documents gaps in knowledge and areas in need of potential further study.