Where:
At the entrance to roads that are narrow or intended for two-way traffic on a single carriageway.
Common at bridges, single-lane roads, or roadworks where vehicles from both directions must share the same road space

Purpose:
To warn drivers that the road ahead is a single carriageway shared by vehicles traveling in both directions.
To ensure safe passage and prevent collisions by controlling which vehicle enters the narrow section first.

Action:
Slow down as you approach the single carriageway.
Look carefully for oncoming traffic before entering the road.
Yield to vehicles already on the carriageway or those closer to the narrow section, allowing them to pass first.
Proceed only when it is safe and the way is clear.
Be alert and patient, especially on roads with limited visibility or sharp bends.