Merge with the traffic in the adjacent lane, from either right or left

What is the meaning of the following traffic sign?

1. Road works - drive in the direction of the appropriate arrow.
2. Lane is closed. No driving in the lane under the traffic sign.
3. Correct answer: Merge with the traffic in the adjacent lane, from either right or left.
4. A hairpin turn, either left or right.

What is the meaning of the sign?

1. Correct answer: Move to the next lane on the right when traffic conditions allow.
2. Pass the obstacle on the right side.
3. Go to the right only.
4. Special lane for public transport.