| http://www.w3.org/ns/prov#value | - While it is unknown at present, it is possible, based on the Dangerous Hill marker specifications above, photographic evidence, and the coloration of the Forkston Speed Limit Keystone Marker, that Keystone Markers used for purposes such as School Zones, Speed Limits, etc., were painted black or blue-on-yellow versus the traditional yellow-on-blue.
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