(1) The driver of Unless otherwise directed by a vehicle shall obey the instructions of an official traffic-control device applicable to his vehicle and peace officer, flag person, crossing guard, or public safety worker, placed in accordance with the provisions driver of this chapter unless otherwise directed by a highway patrol officer or police officer, subject to vehicle shall obey the exceptions granted in this chapter instructions to of the an driver of an authorized emergency official traffic control device applicable vehicle to and the to driver's the vehicle driver and placed of in a motor vehicle in a funeral procession. accordance with the provisions of this chapter. The driver of an authorized emergency vehicle, a police vehicle, or a highway patrol vehicle and the driver of a motor vehicle in a funeral procession are exempt from

(2) A provision of this chapter for which signs traffic control devices or flag persons are required may not be enforced against an alleged violator if at the time and place of the alleged violation an official sign traffic control device or flag person is not in proper position and sufficiently legible or visible to be seen by an ordinarily observant person. Whenever a particular section of this chapter does not state the signs that official traffic control devices or flag persons are required, the section is effective even though no signs traffic control devices are not erected or in place.

(3) Official traffic control devices or flag persons that are placed or held in position substantially conforming to the requirements of this chapter and the requirements of the uniform system adopted by the department of transportation pursuant to 61-8-202 are presumed to have been placed by an official act or at the discretion of a lawful authority.

Obedience to traffic-control traffic control devices -- – exception for emergency certain vehicles and funeral processions