What must be posted "in plain view" of workers at the jobsite to ensure safety?

Posting emergency telephone numbers "in plain view" of workers at the jobsite is crucial for ensuring safety because these numbers provide immediate access to assistance in case of an emergency. This could include numbers for fire departments, hospitals, poison control centers, or emergency response teams. When workers can easily see these numbers, they can quickly react in situations that require urgent attention, such as accidents or medical emergencies.

Having critical contact information prominently displayed also reinforces a work environment focused on safety and proactive responses to potential hazards. It ensures that even in stressful situations, workers don't have to spend time looking for important contact details, which could delay emergency response and potentially worsen an already dangerous situation. While the other options provide valuable information regarding safety protocols and policies, emergency numbers are essential for immediate action when safety incidents occur.