What is required for warning signs when occupational exposure exceeds the PEL?

When occupational exposure exceeds the permissible exposure limit (PEL), the requirement for warning signs is to limit access through visible signs. This is crucial for ensuring that individuals are aware of the hazardous conditions and are prevented from entering areas where they may be at risk of overexposure to hazardous substances. Visible signs serve as a clear and immediate alert, making it essential for maintaining safety in the workplace.

The visual aspect of these signs acts not only as a warning but also informs employees of the potential dangers present in the area. By restricting access to those who have the necessary training or protective equipment, it helps mitigate the risk of health issues related to lead exposure or other hazardous materials.

In contrast, the other options, such as informational pamphlets, specific color coding for hazards, and daily updates, while possibly useful for other safety communication, do not specifically address the immediate need for controlling access in scenarios where exposure limits have been exceeded. Signage dedicated to warning and controlling access is the most effective method of enforcing safety protocols in these high-risk situations.