It shall be unlawful for the owner of a bicycle to permit any child to operate his bicycle upon a public street of the Borough of West Reading, unless such child or person is capable of operating a bicycle with safety to himself and the public generally. If a child shall have satisfactorily passed an oral examination given by the Police Department of the Borough of West Reading to determine his ability to ride a bicycle, and to determine his knowledge of safe riding rules and practices prescribed under this chapter, the passing of such examination shall be prima facie evidence under this chapter of the ability of such child to operate a bicycle with safety.