What must you be aware of when you see this road traffic sign?

The sign you see is a warning sign indicating a risk of falling rocks or debris from above. When you encounter this sign, it's essential to be aware of the following:

1. **Avoid stopping and parking**: Stopping or parking in areas where rocks might fall can be extremely dangerous. The sign indicates that the roadway is not safe for halting your vehicle.

2. **Stones may be lying on the roadway**: This indicates that there might already be loose stones or debris on the road, which can pose a hazard to vehicles and make driving conditions perilous.

3. **Vehicles in front may brake suddenly**: Drivers may react unexpectedly to falling rocks or debris, causing them to brake suddenly. Being prepared for such actions is crucial for maintaining a safe distance and preventing collisions.

Recognizing and understanding each of these points is vital for ensuring safety on the road when encountering this sign. Following these guidelines will help reduce accidents and increase safety for all road users.