What is the meaning of the following traffic sign?

- Correct answer: It is permitted to drive in this lane.
- Driving in this lane is permitted during the night only.
- Driving in this lane is prohibited.
- Pass to the adjacent left lane.
Why this is the answer
The correct answer in the official bank: It is permitted to drive in this lane.
This sign is placed above a lane and shows the state of the lane below it. A green arrow pointing down means the lane is open and you may drive in it, as long as the arrow is displayed. It is not limited to night only. When driving in the lane is prohibited, a red X is usually displayed.