What type of control are the instructions requiring permission to cross red lines next to the runway?

The requirement for permission to cross red lines next to the runway is an example of administrative control. Administrative controls are policies, procedures, and directives established to manage and guide behavior in order to ensure safety and compliance. In this context, the instructions serve to regulate the actions of individuals and vehicles in proximity to the runway, thereby minimizing the risk of accidents and enhancing operational safety.

By requiring specific permissions, administrative controls help in enforcing safety protocols and ensuring that personnel understand the risks associated with crossing specific boundaries near the runway. This demonstrates a proactive approach in managing safety through structured guidelines and oversight, which is the hallmark of administrative controls.

Other types of controls such as physical, critical, and technical serve different purposes. Physical controls involve tangible barriers or safeguards, critical controls focus on high-risk areas where safety needs to be prioritized, and technical controls utilize technology to mitigate risks, none of which directly applies to the need for adherence to set instructions for crossing defined boundaries in this scenario.