How far can a vessel be from another while still needing to display warning lights when towing?

The correct answer demonstrates that distance does not affect the requirement to display warning lights when towing. This is critical for safety because displaying warning lights ensures that other vessels are aware of the tow, regardless of how far apart they are. The regulations emphasize the importance of visibility and awareness on the water to prevent accidents and ensure safe navigation.

In situations involving towing, it becomes essential to communicate the presence of the tow as effectively as possible. Therefore, even if the vessels are far apart, the towing vessel must still adhere to the regulations regarding the display of warning lights to signal its operation.

The other choices imply limitations based on distance or scenarios that do not align with safety regulations for towing. For instance, indicating that there is a specific distance or scenario in which lights are required undermines the necessity of maintaining visibility for all vessels involved.