Whenever any ordinance of the City designates any one-way street,
the City Traffic Engineer shall place and maintain 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 described and designated
by ordinance, 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.