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At an intersection, a steady yellow arrow pointing left indicates to the driver that

A the signal is about to change to a green or red light or to a red arrow.

A steady yellow arrow warns drivers that the time period of "protected" turning is ending. Be prepared to obey the next signal, which could be a green or red light or a red arrow. If you are approaching the intersection, you must stop. [Traffic Signal Lights; Traffic Controls; California Driver Handbook]