Where:
On any road where a bridge ahead reduces the width of the roadway.
These signs are commonly placed in rural areas, on older bridges, or on roads where the bridge design cannot accommodate two wide vehicles passing side by side.
The narrowing may occur from both sides or predominantly on one side.

Purpose:
To warn drivers that the road will become narrower when crossing the bridge, potentially reducing the space available for vehicles travelling in both directions.
This alert helps prevent collisions, particularly with oncoming traffic, by encouraging drivers to approach the bridge cautiously and assess whether it is safe to cross.

Action:
Reduce speed well before reaching the bridge to allow sufficient time to react to oncoming vehicles.
Observe the width of the bridge and check for road markings or signs indicating which vehicle has priority.
Yield to oncoming traffic if the bridge is too narrow for two vehicles to pass safely at the same time.
Keep to your side of the bridge and maintain control of your vehicle while crossing.
Avoid overtaking near or on the bridge, as space is limited and visibility may be restricted.
Be alert for pedestrians, cyclists, or slow-moving vehicles that may also be using the bridge.
Drive at a speed that allows you to stop or maneuver safely if another vehicle approaches unexpectedly.