Which type of light is used to indicate the presence of a vessel pushing another?

The type of light used to indicate the presence of a vessel pushing another is a special flashing light. This is specifically designed to communicate to other vessels that the pushing vessel is engaged in a particular maneuver—indicating its status as a towing or pushing vessel on the water. The use of this distinctive light helps other mariners recognize the vessel's function and avoid potential collisions.

The design and operation of navigation lights, including the special flashing light, follow the regulations established by the International Regulations for Preventing Collisions at Sea (COLREGs). These regulations emphasize the importance of clarity in communication on the waterways, and a special flashing light serves as an effective indicator of a vessel’s operational status.

While other lighting options like searchlights, flashing lights, or single white lights may serve different functions or indicate other scenarios, the special flashing light is uniquely specified for situations involving vessels that are pushing or towing another vessel. This ensures that all mariners can navigate safely and be aware of the movement patterns of larger or coupled vessels.