Whenever the City Commission designates any street or alley or part thereof as a one-way street or alley, the city shall have placed or maintained signs giving notice thereof; and no such regulation shall be effective unless such signs are in place. Signs indicating the direction of lawful traffic movement shall be placed at every intersection where movement of traffic in the opposite direction is prohibited.
Upon those streets and parts of streets and in those alleys and parts of alleys so designated as one-way streets and alleys, vehicular traffic shall move only in the indicated direction when signs indicating the direction of traffic are erected and maintained at every intersection where movement in the opposite direction is prohibited.
A vehicle passing around a rotary traffic island shall be driven only to the right of such island.