Which of the following is a special fall hazard that may call for increased protection?

In construction environments, recognizing special fall hazards is crucial for ensuring worker safety. Increased protection is necessary in situations where there is a higher risk of falls or injuries, which can occur due to various environmental factors.

Slippery surfaces are common hazards that can easily lead to slips and falls, necessitating precautions such as non-slip footwear or surface treatments to enhance traction.

Overhead power lines pose a different type of danger. While they do not directly relate to slips, the risk of electrocution becomes a significant concern when working at heights near these lines. Workers need to maintain a safe distance and use protective measures to mitigate this risk.

Unstable scaffolding can lead to falls if the structure is not properly erected or if it is overloaded. Ensuring that scaffolding is stable and adheres to safety regulations is critical to prevent accidents.

Since all of these factors represent different but significant fall hazards, increased protection measures must be implemented in each case. This makes recognizing the cumulative nature of these hazards important for overall safety management in construction settings. Therefore, acknowledging that all of these hazards require increased protection is the best approach to enhancing worker safety.