Barges being towed at night must exhibit navigation lights __________.

Barges that are towed at night must exhibit navigation lights at all times to ensure they are visible to other vessels in the vicinity. This requirement is crucial for safety, as navigation lights play a significant role in preventing collisions and providing information about the characteristics of the vessel. For instance, specific lights indicate whether a vessel is anchored, underway, or being towed, which is essential for other vessels to assess the situation appropriately.

The requirement to exhibit lights at all times underscores the importance of being visible in varying conditions, particularly at night or in low visibility. Proper navigation lighting ensures that all vessels can see the barge and its tow, which is vital for maintaining safe distances and navigating appropriately around them.