It shall be unlawful for any person to go upon any bus carrying passengers for hire in the City and litter from such bus or to dump, throw, deposit, place or leave any refuse of any kind, or any object or substance which tends to pollute, mar or deface, into, upon or about any bus carrying passengers for hire. Any motorman or conductor of any such bus is hereby empowered to use such reasonable force as may be necessary to prevent any person from littering, etc., while on any such bus or to eject such person from the vehicle. (Code 1981 § 46-28. Code 1995 § 154-30.)