What is the meaning of the following traffic signs?

- Give right-of-way on a narrow road.
- Correct answer: The number of lanes on the road is decreasing.
- Careful! One-way traffic ahead.
- Entrance to a single lane one-way road.
Why this is the answer
The correct answer in the official bank: The number of lanes on the road is decreasing.
This sign warns that the number of lanes on the road is decreasing, so one lane ends and merges into the neighbouring lane. Drivers in the ending lane should signal, slow down if needed and merge only when it is safe. The sign does not mark a one-way road or a narrow road where you must give way.