What is a common requirement for commercial vessels concerning distress signals?

Commercial vessels are required to carry a minimum number of distress signals appropriate for their voyage to ensure safety at sea. This requirement is based on regulations outlined in the International Convention for the Safety of Life at Sea (SOLAS) and local maritime laws, which mandate that vessels must have sufficient distress signals that are suitable for the expected conditions of their journey. The types and quantities of distress signals required can vary based on the type of vessel, the area of operation, and the length of the voyage. This preparedness is crucial for ensuring that a vessel can effectively communicate its distress and enhance the chances of a successful rescue in case of an emergency.

The other options suggest misconceptions about the requirements for distress signals. For instance, while crew safety is important, the notion that signals must be equipped for every crew member is not a standard regulation, as the focus is on the vessel's capability to signal. Additionally, the idea that distress signals are only needed in crowded waters ignores the fundamental necessity for safety equipment regardless of traffic conditions. Lastly, the suggestion that size exempts a vessel from carrying distress signals contradicts safety regulations intended to protect all vessels and their crews, irrespective of their dimensions.