What are the features of a special flashing light?

The correct choice highlights that a special flashing light is yellow and is used specifically on the vessel being pushed ahead of a tow. This feature is important because it helps other vessels identify a towed vessel's position and behavior in a tow situation, enhancing safety and navigation on the water.

Yellow lights serve to indicate a specific status or function of the vessel in the context of towing operations. Understanding how these lights operate and their designated colors is crucial for mariners to ensure communication and visibility on the water, especially in busy shipping channels or when maneuvering in restricted conditions.

In contrast, the other options reflect uses or colors not aligned with the defined role of a special flashing light. For instance, distress signals typically utilize red lights, while signaling lights may be white and have different applications from a special flashing light. Additionally, the reference to open sea is not applicable, as the function of special flashing lights is more relevant in towing scenarios rather than general navigation at sea.