(A) The driver of any vehicle shall obey the directions of any official traffic-control device applicable thereto and placed in accordance with this chapter or other traffic ordinances of the town, unless otherwise directed by a police officer, subject to the exceptions granted the driver of an authorized emergency vehicle.
(B) No provision of this chapter which provides for signs shall be enforced against an alleged violator if, at the time and place of the alleged violation, the official sign is not in proper position or is insufficiently legible to an ordinarily observant person. Whenever a particular section does not stipulate signs, the section shall be effective without signs being placed to give notice thereof.
(`94 Code, § 15-21)