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Question:

You see a steady yellow "X" signal over your traffic lane. What does it mean?

A Change lanes as soon as it is safe to do so.
Explaination

Lane use control signals are special overhead signals indicating which lanes of a roadway may be used in different directions at various times. A steady yellow "X" over your lane means that the direction of travel for this lane is about to be reversed, at which point the signal will have changed to a steady red "X". You must change lanes before this happens.