Which of the following is NOT a requirement of a primary escape way?

The requirement for a primary escape way is crucial in ensuring the safety of miners during emergencies. A primary escape way is designed to provide a safe route for miners to evacuate from hazardous areas within a mine.

In this context, being open to all areas of the mine is not a requirement for a primary escape way. The primary escape way must be accessible from the working areas of the mine and provide a safe route for evacuation, but it does not need to give access to all areas of the mine. Specific sections of a mine may have different safety protocols, and not all areas would require direct access through a primary escape way.

On the other hand, an intake airway is necessary to supply fresh air and ensure safe breathing conditions, while being free from fire risk and trafficable by machine are essential to ensure that miners can evacuate safely and efficiently, even in emergencies. Therefore, option C is the correct choice as it reflects a misinterpretation of the requirements for a primary escape way in comparison to the essential safety criteria represented by the other options.