When lane-direction-control signals are placed over the individual lanes of a street or highway, such signals shall indicate and apply to drivers of vehicles as follows:
(a) Green indication. Vehicular traffic may travel in any lane over which a green signal is shown.
(b) Steady yellow indication. Vehicular traffic is thereby warned that a lane control change is being made.
(c) Steady red indication. Vehicular traffic shall not enter or travel in any lane over which a red signal is shown.
(d) Flashing yellow indication. Vehicular traffic may use the lane only for the purpose of approaching and making a left turn.