Where:
On any public road. These bends are typically found on roads where the route changes direction abruptly to follow the contours of the land.
A hairpin bend is much sharper than an ordinary curve or corner, often turning back almost in the opposite direction.

Purpose:
To warn drivers that the road ahead makes an extremely sharp turn, requiring a significant reduction in speed and careful vehicle control.
The sign helps prevent loss of control, skidding, or overturning, especially for heavy vehicles or those travelling too fast.
It also alerts you to the possibility of oncoming traffic crossing into your lane while negotiating the bend.

Action:
Reduce your speed well in advance of the bend, approach slowly and be prepared to stop if necessary.
Select a lower gear before entering the bend, particularly when going downhill, to maintain steady control of speed.
Keep to your lane and steer smoothly through the turn; avoid wide or sudden steering movements.
Do not overtake near or on a hairpin bend, as visibility of the road ahead is extremely limited.
Be cautious of oncoming vehicles, cyclists, or pedestrians who may also be navigating the tight curve.
Use your horn briefly (where permitted) when approaching blind hairpin bends on narrow roads to warn other road users of your presence.
Drive at a speed that allows you to stop safely within the visible distance, especially in wet, foggy, or dark conditions.