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You see a flashing yellow 'X' signal above a reversible lane. What does this signal mean?


A yellow flashing 'X' may be used above a reversible lane. This signal states that the lane can only be used for turning. A solid (non-flashing) yellow signal is used to warn drivers that a lane is closing, while a red signal tells drivers that the lane has closed. [Reversible Lanes, Rules of the Road, Washington Driver Guide]