What does a red X signify in a reversible lane?

A red X in a reversible lane indicates that the lane is closed to traffic. This signaling is crucial for maintaining safety on the roadway, especially in situations where traffic patterns may change based on time of day or traffic conditions. When drivers see a red X, they must not use that lane; doing so could lead to dangerous situations, such as collisions with oncoming vehicles or other hazards.

In contrast, the other options describe situations that do not accurately reflect the meaning of a red X. For example, open lanes would typically be indicated by a green arrow or no red signal at all, while lanes designated for specific purposes, such as left turns or emergency vehicles, would have their own unique markings or signs, distinct from the red X. Therefore, the understanding of traffic signals, particularly the red X, is essential for safe and compliant driving in areas with reversible lanes.