No vehicle shall exceed a total outside width, including any load thereon, of eight feet. No vehicle unladen or with load shall exceed a height of twelve feet. No vehicle unladen or with load shall exceed in length the following overall dimensions, inclusive of front and rear bumpers and including load:
(a) Single vehicles, thirty-five feet, except buses equipped for carrying passengers, but then not in excess of forty feet;
(b) Tractor and semitrailer combined, fifty feet; and
(c) Combination of vehicles, including straight trucks and full trailers, fifty feet.
(1958 Code § 16.100)