(A) No person shall drive a vehicle over any public bridge, causeway, viaduct, or other elevated structure at a speed which is greater than the maximum speed which can be maintained with safety thereon when such structure is posted with signs as provided in division (B) below.
(B) The Department of Transportation or the City Council may conduct an investigation of any bridge or other elevated structure constituting a part of a highway under its jurisdiction, and if it finds that the structure cannot safely withstand vehicles traveling at the speed otherwise permissible, the Department or the City Council shall determine and declare the maximum speed of vehicles which the structure can safely withstand and shall cause suitable signs stating the maximum speed to be erected and maintained before each end of the structure.
(C) Upon the trial of any person charged with a violation of division (A) above, proof of the determination of the maximum speed by the Department or the City Council and the existence of such signs shall constitute conclusive evidence of the maximum speed which can be maintained with safety on the bridge or structure.
(Neb. RS 60-6,189) Penalty, see § 71.999