any of the state highway historical markers have now been in service for sixty years
or longer. The marker materials and design were selected in part for their permanence
and the fact that they wear well under all weather conditions. Still, regular maintenance,
such as painting, straightening, or post replacement, is required from time to time.
The Department of Transportation conducts such maintenance as necessary.
Each year a few signs are destroyed by vandals or in traffic accidents. Individuals
can assist by reporting missing signs or maintenance needs to the Research Branch
of the Office of Archives and History.