Where:
On any road, particularly at points where a one-way street or road section is about to end and merge into a two-way traffic flow.
These signs are often placed on urban roads, highways, or rural routes where drivers might not expect oncoming traffic due to the preceding one way traffic pattern.

Purpose:
To warn drivers that the road ahead will no longer be one-way, and that traffic will flow in both directions.
This notice is important because drivers may be accustomed to a clear lane ahead on a one-way road, and suddenly encountering oncoming vehicles requires heightened attention and caution.
The sign helps prevent head-on collisions and unsafe maneuvers, especially when overtaking or turning.

Action:
Be alert for oncoming traffic as you enter the two-way section; check mirrors and blind spots carefully.
Reduce speed if necessary to safely adapt to the presence of vehicles coming from the opposite direction.
Exercise caution when overtaking, ensure there is enough space and time to pass safely without interfering with oncoming traffic.
Stay in your lane and avoid cutting corners, as the road may be narrower than expected.
Use signals appropriately when turning or changing lanes to inform other road users of your intentions.
Maintain a safe distance from vehicles ahead to allow room for unexpected stops or maneuvering.
Drive defensively and be prepared for vehicles that may enter the roadway from side streets, driveways, or intersections, now that traffic flows in both directions.