(A) The village shall place and maintain appropriate signs and traffic-control devices conforming to the Illinois Department of Transportation Manual for Uniform Traffic Control Devices, at all designated intersections and at all streets and alleys, so that the driver of any motor vehicle may be aware of and obey the provisions of Chs. 77 and 78.
(B) No provision of Chs.
77
or
78
for which official traffic-control signs or devices are required shall be enforced against an alleged violator if at the tie and place of the alleged violator if at the time and place of the alleged violation an official device is not in proper position and sufficiently legible to be seen by an ordinarily observant person.
(C) Whenever any official traffic-control sign or device is placed or held in position approximately conforming to the requirements of the state statutes and purports to conform to the lawful requirements pertaining to such device, such device shall be presumed to have been so placed or held by the official act or direction of lawful authority, and comply with the requirements of the state statutes unless the contrary shall be established by competent evidence.