Where:
On any public road, particularly in mountainous, hilly, or winding areas where the road features two sharp curves in quick succession, bending in opposite directions, first to the left, then to the right, or vice versa.

Purpose:
To warn drivers that the road ahead has two consecutive sharp curves that require careful handling.
Unlike a single curve, combined curves demand more precise steering and speed control because the vehicle must quickly adjust from one direction to the opposite.
The sign alerts drivers to the increased risk of skidding, losing control, or colliding with oncoming traffic if the curves are taken too fast.

Action:
Reduce speed well before the first curve, allowing for smooth navigation of both bends.
Keep your vehicle in the correct lane throughout both curves; avoid cutting across lanes as the curves may be blind.
Steer gently and steadily, adjusting for each bend while maintaining full control.
Be alert for oncoming vehicles, cyclists, pedestrians, or obstacles that may appear suddenly around the curves.
Do not overtake on or near combined curves due to limited visibility and the rapid change in direction.
Maintain a safe following distance from vehicles ahead, as they may slow or brake suddenly while negotiating the bends.
Drive at a speed that allows you to stop safely within the distance you can see, adjusting for weather conditions, road surface, and visibility.