No person shall transport material of any kind over, along or across the public streets on wagons, cars or vehicles of any kind, or by any method, unless the same is so transported or carried that no portion of any material falls or is deposited upon the public streets. The gears of all wagons or vehicles of any kind used to haul or transport earth or other material along the public streets shall be cleaned before leaving the loading place, and also before leaving the dumping place, and especially shall all wagons hauling earth, sand, rock, straw, brush, hay, rubbish, garbage, swill, cesspool or privy contents or other material, manure or commercial fertilizer be so constructed that such material will not waste through and be deposited upon the street, in whole or in part, but this shall not apply to depositing material on the streets under lawful permits for building or improvement purposes.
(`78 Code, § 12.20.010.)