No opening or excavation in any street shall extend beyond the center line of the
street before being backfilled and the surface of the street temporarily restored.
On arterial streets or major thoroughfares, no excavation shall extend across more
than one traffic lane unless, in the opinion of the director of transportation and
environmental services, such excavation will not unduly impede traffic. No opening
shall be any larger in size than specified by the permit provided for in section 5-2-141. (Code 1963, Sec. 33-63)