What does a green arrow in reversible lanes indicate?

Answer: B — You can use the lane beneath

A green arrow in reversible lanes signals that vehicles may proceed into the lane beneath the arrow. This indicates that the lane is open for use in the direction of the green arrow. Reversible lanes are designed to accommodate varying traffic patterns, allowing for flexibility based on the time of day or traffic flow. When the green arrow is displayed, drivers are instructed that it is safe to enter and travel in that lane, thus improving traffic efficiency. In contrast, other signage—like a red X—would indicate to drivers that they cannot use the lane, highlighting the importance of recognizing and responding to these signals accurately for safe driving.