What does a flashing yellow "X" over a traffic lane indicate?

A flashing yellow "X" over a traffic lane indicates that the lane is for left turns only. This signal serves as guidance to drivers, alerting them that they can use this lane specifically for making left turns while proceeding with caution. The flashing nature of the "X" implies that while the lane is available for use, drivers should be aware of potential hazards and approach the intersection or other vehicles with care.

Other options do not accurately describe the function of the flashing yellow "X." For example, a closed lane would typically be indicated by a solid red "X" or a different type of signal entirely. Similarly, lanes for emergency vehicles have specific markings that distinctly denote their use; a flashing yellow "X" does not serve that purpose. Understanding these signals is crucial for safe driving and adherence to traffic laws.