A.   Compliance Required: No person shall violate any rule, regulation, traffic direction, sign or marking adopted, prescribed or established in accordance with the provisions of this title, unless otherwise directed by a police officer. (1984 Code § 23-2)
   B.   Effect: No supplemental traffic rule or regulation for which signs are required shall be enforceable against an alleged violator if, at the time and placed of the alleged violation, the required sign is not in proper position and sufficiently legible to be seen by an ordinarily observant person. (1984 Code § 23-112)