Adequately maintained retroreflective signs improve highway safety and prevent roadway departure crashes by bouncing light from vehicle headlights back toward the vehicle and the driver's eyes, making the signs appear brighter and easier to see and read. Because the retroreflective properties of traffic control devices deteriorate over time, highway agencies need to actively manage the maintenance of signs in order to ensure that they are clearly visible at night.
NOTE: Revisions to reflect the May 2012 final rule that changed the MUTCD compliance date requirements have not yet been made to this document and should be kept in mind while viewing the document.
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