It is unlawful for any person to drive a tractor, agricultural implement, truck over 9,000-pounds' gross vehicle weight, truck-trailer, tractor-trailer or truck tractor in through traffic, upon any street except those which have been designated and sign-posted as truck routes. For the purpose of this chapter, "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.