A.
When any bridge or viaduct within the City shall be deemed by the Commissioner of Public Works to be unsafe for traffic or unsafe for full traffic, he is authorized to close such structure to traffic, wholly or partially, and he shall post in a conspicuous place upon such a structure a notice of such total or partial closing to traffic, which notice, if a partial closing, shall clearly indicate the reason for and the extent of such limitation.
B.
Upon such closing, the Commissioner of Public Works shall immediately, in writing, notify the Commissioner of Police of his action; and if the closing is partial, the notice shall state specifically the reason traffic is limited or restricted and to what extent; and the Commissioner of Police shall enforce the closing or partial closing of such bridge or structure.
C.
No person shall pass over or drive any vehicle over any bridge or structure, so closed, in violation of a notice posted as provided herein.