What applies to movements against the current of traffic?

Movements against the current of traffic must not be made unless authorized because these situations pose potential safety risks and operational challenges. The requirement for authorization ensures that proper coordination, communication, and precautions are in place, helping to prevent collisions and ensure the safety of personnel and equipment. This is particularly important in rail operations, where the dynamics of traffic flow can significantly impact the safety of movements. Only through proper oversight and authorization can such movements be conducted responsibly, mitigating the risks associated with operating against established traffic patterns.

In contrast, other options suggest scenarios that could lead to unsafe practices. For instance, the idea that movements could be conducted without supervision contradicts the emphasis on safety protocols. Allowing movements under any circumstances could lead to severe risks and potential accidents. Suggesting that restrictions only apply during peak hours does not address the inherent dangers of moving against traffic at any time, thereby neglecting the need for comprehensive control and oversight.