It shall be unlawful for any person to transport any living animal on the running board, fenders, hood, or other outside part of any vehicle unless suitable harness, cage or enclosure be provided and so attached as to protect such animal from falling or being thrown therefrom. It shall be unlawful for any person to transport any persons upon the running board, fenders, hood or other outside part of any vehicle, except that this provision shall not apply to authorized emergency vehicles or to solid waste collection vehicles that are engaged in collecting solid waste or recyclables on route at speeds of twenty miles per hour or less.