No person shall operate a motor vehicle within a county park at a speed in excess of the posted speed limit, in excess of a reasonably safe speed, or in excess of 10 miles per hour where no speed limit is posted. The parks division, upon finding that conditions so warrant, may establish speed limits higher or lower than 10 miles per hour and shall cause such limits to be posted in the areas where so established. (Added by § 6 of Res. adopted Apr. 22, 1974; Amended by Ord. 86-001 § 2, Feb. 12, 1986; Amended by Ord. 93-066, Aug. 18, 1993, Eff date Aug. 28, 1993).