Pink is used for:

Pink (or fluorescent pink) is the designated color for incident management signs. These temporary signs with black lettering warn drivers of unexpected roadway conditions caused by unplanned events such as traffic crashes, natural disasters (like floods, fires, or storms), or hazardous material spills.
Incident management signs are used to alert drivers to changing traffic patterns, lane closures, or detours. Common examples include “Lane Ends,” “Exit Closed,” or “Detour.” Their purpose is to help drivers navigate safely around emergency scenes and respond appropriately to rapidly changing road conditions.

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