What is an Operations Notice (ON) best described as?

An Operations Notice (ON) is effectively a communication tool that provides vital information regarding changes in operating rules or procedures. This means that it serves to inform personnel about the existing conditions and standards that must be adhered to while conducting operations. The purpose of such notices is to make sure that all team members are on the same page concerning the operational policies that may affect safety and efficiency.

In this context, while other options may have some relevance, they do not encapsulate the primary function of an Operations Notice. For instance, while a temporary order for train schedules or a notice that affects train movements may send out important information, they are not the core focus of what an Operations Notice represents. Similarly, mentioning a specific location where signals are controlled is outside the realm of the definition, as it pertains to specific operational elements rather than the advisory nature of an ON.