The Director of Public Works or his/her designee is authorized to regulate the timing of traffic signals so as to permit the movement of traffic in an orderly and safe manner at speeds slightly at variance from the speeds otherwise applicable within the district or at intersections and shall erect appropriate signs giving notice thereof.
A. 
Any speed in excess of the limits specified in this section shall be prima facie evidence that the speed is not reasonable or prudent and that it is unlawful.
(1) 
Twenty miles per hour in the area within 300 feet of any playground entrances and exists during the daytime.
B. 
The provisions of Subsection A(1) shall not apply except when appropriate warning signs are posted in proximity with the boundaries of the area within 300 feet of such playground.
C. 
For the purposes of this section, "daytime" means from 1/2 hour before sunrise to 1/2 hour after sunset.