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Lane Use Control Signals
21454. When lane use control signals are placed over individual lanes, those signals shall indicate and apply to drivers of vehicles as follows:
(a) Green indication: A driver may travel in any lane over which a green signal is shown.
(b) Steady yellow indication: A driver is thereby warned that a lane control change is being made.
(c) Steady red indication: A driver shall not enter or travel in any lane over which a red signal is shown.
(d) Flashing yellow indication: A driver may use the lane only for the purpose of making a left turn to or from the highway.