Whenever any ordinance of the Village designates any one-way
street or alley, the Village 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 and in those alleys
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.