Final answer:
A yellow "X" over a lane signifies that the lane is closed or not in use, and drivers should merge into a different lane.
Step-by-step explanation:
A yellow "X" over a lane signifies that the lane is closed or not in use. It is commonly used in construction zones or to indicate a lane closure due to an accident or maintenance work.
When drivers see a yellow "X" over a lane, they should merge into a different lane as soon as it is safe to do so. Ignoring the yellow "X" and continuing to drive in the closed lane can be dangerous and may result in a traffic violation.
For example, if you see a yellow "X" over the left lane on a highway, you should move to the right lane or another open lane to continue driving.