Section 31.The college parking office is authorized to erect signs, barricades, and other structures and to paint marks and other directions upon the streets and roadways for the regulation of traffic and parking upon state lands devoted mainly to the educational or research activities of the college. Such signs, barricades, structures, markings and directions shall be so made and placed as in the opinion of the college physical plant director will best effectuate the objectives stated in section 2 [WAC 132K-116-015] . No person without authorization from the college physical plant director shall move, deface, or in any way change a sign, barricade, structure, marking, or direction so placed, or previously placed, for the purpose of regulating traffic or parking.