The museum director may determine hours for public visitation or use of a State museum, and shall publish and post a schedule of open hours. A person or vehicle may not enter or remain on lands or waters owned or managed by a State museum after the posted open hours without the express permission of the museum director. The museum director may elect to close certain areas of the museum to public entry and travel during periods of construction, maintenance, hazardous road conditions, forest operations, or high fire hazard, for protection of the environment or for another purpose determined by the museum director. Closed areas shall be clearly posted against public entry. A person or vehicle may not enter or remain on an area closed to public entry. Vehicles remaining on lands or waters after posted open hours or on areas closed to public entry may be removed and placed in storage at the owner's expense. This regulation does not apply to employees or contractors of the Department or the State on official business.