How do the 'International Collision Regulations' affect local rules made by a port or harbour?

The correct answer reflects that the International Collision Regulations (COLREGs) provide a standard framework that local rules are expected to follow. This means that while ports and harbours can establish their own specific regulations tailored to local conditions and needs, these local rules cannot conflict with the overarching principles and provisions set forth in the COLREGs. The aim of the COLREGs is to ensure safe navigation and prevent collisions at sea, establishing a common set of guidelines for vessels to follow regardless of where they are operating.

Local regulations may enhance safety measures or address unique environmental factors, but they must align with the fundamental navigation rules established in the COLREGs. By adhering to this structure, both international and local maritime practices work together to create a consistent and safe operating environment for all vessels.