Final answer:
A red X in a reversible lane indicates that the lane is closed and should not be used for traffic in that direction.
Step-by-step explanation:
A red X in a reversible lane indicates that the lane is closed and should not be used for traffic in that direction. It is used to control the flow of traffic and is typically displayed on an electronic sign above the lane. When the red X is displayed, drivers should not enter the lane and should find an alternative route.