No person shall operate a vehicle contrary to the direction of provisions of any barrier or sign erected:
A. Pursuant to the provisions of any ordinance of the City, or
B. By any public utility, or
C. By any department of the City, or
D. By any person pursuant to law or contract with the City, nor shall any unauthorized person move or alter the position of any such barrier or sign. (3210.31 -- Ord. 996 § 2 (part), 1959).