What is the function of a GENERAL NOTICE (GN)?

The function of a GENERAL NOTICE (GN) is primarily to provide instructions that don't have an immediate operational impact on train movement. These notices serve as a way to communicate information, updates, or regulations that are pertinent to railway operations but do not require immediate action or alteration in procedures affecting train schedules, movements, or safety protocols.

In the context of the options, this distinction emphasizes that while the GN might contain important information, it is not used for directives that would affect operational aspects such as scheduling or train movements directly. The nature of a GN focuses on conveying information that personnel should be aware of, without necessitating immediate responses or changes to regular operational practices.