(a)   No pedestrian or driver of a vehicle shall disobey the instructions of any traffic control device placed in accordance with the provisions of this Traffic Code, unless at the time otherwise directed by a police officer.
   (b)   No provisions of this Traffic Code for which signs are required shall be enforced against an alleged violator if at the time and place of the alleged violation an official sign is not in proper position and sufficiently legible to be seen by an ordinarily observant person. Whenever a particular section of this Traffic Code does not state that signs are required, that section shall be effective even though no signs are erected or in place.
   (c)   If the offender commits the offense while distracted and the distracting activity is a contributing factor to the commission of the offense, the offender is subject to the additional fine established under Section 303.991 of the Traffic Code. (ORC 4511.12)