The Director of Public Safety is hereby authorized to establish over an appropriate street and to designate by appropriate signs, through traffic routes for the movement of vehicles of three or more tons capacity designed for carrying merchandise, freight or material. When any such through traffic route is established and designated by appropriate signs, the operator of any vehicle mentioned in this section shall have on such route and none other except when it is impractical to do so or when necessary to traverse another street to a destination for the purpose of loading or unloading, but then only by such deviation from the nearest through route as is reasonably necessary.
('86 Code, § 11.16.030) (Ord. 2479, passed - - ; Am. Ord. 4062, passed - - )