It is unlawful for any person to drive a tractor, agricultural implement, truck (other than pick-up truck), automobile trailer or automobile to which a trailer is attached, in through traffic, upon any street except those which have been designated and sign-posted as “truck routes.” For the purpose of this section, “through traffic” means originating without the city and with a destination without the city, as distinguished from “local traffic” which means traffic either originating or having a destination within the city.
(`86 Code, § 6.01) Penalty, see § 10.99