What is one of the main purposes of mandatory directives?

One of the main purposes of mandatory directives is to establish authority for train movements and restrictions. These directives are issued to convey instructions that must be followed to ensure the safe and efficient operation of the railroad system. They serve a critical role in controlling train movements, especially in situations where safety could be compromised, such as in a work zone, near a signal, or when a train must be held or routed differently due to a specific condition. By having clear directives, crews are provided with the necessary authority to act in accordance with established safety protocols, thereby protecting both personnel and equipment on the railway.

In contrast to operational updates or communication protocols, mandatory directives focus specifically on the requirements for safety and compliance with established procedures, reflecting their essential role in the operational framework of railroad safety.