To Park a vehicle upon any grade or slope exceeding three percent without effectively setting the brakes and blocking the wheels of the vehicle by turning them against the curb or by other means. For the purpose of the issuance of a notice of violation of this Section, proof that an unattended vehicle Parked on a grade exceeding three percent was involved in a collision shall establish a presumption that such unattended vehicle was Parked in violation of this Section. (58(a))
(Amended by Ord. 287-08, File No. 081340, App. 12/5/2008)