Which signal would indicate a vessel restricted in its ability to maneuver?

The signal indicating a vessel restricted in its ability to maneuver is represented by the configuration of red over white over red lights. This specific arrangement is part of the navigation and signal regulations outlined in international maritime law. The three lights signify to other vessels that the ship is restricted in its ability to maneuver, which could be due to a variety of reasons such as fishing operations, towing, or maintenance work. This communication is crucial for ensuring the safety of navigation and collision avoidance.

Other signals, while also relevant in maritime contexts, serve different purposes. For example, one short blast typically indicates that a vessel is altering its course to starboard, which does not convey any restrictions on maneuverability. Green over white lights indicate a fishing vessel engaged in fishing, but again, do not express any restrictions on moving. Three long blasts serve as a signal for a vessel that is restricted in its ability to maneuver but does not specifically denote the same as the continuous light arrangement of red over white over red. Thus, the unique configuration of the lights clearly communicates the specific situation regarding the vessel's maneuverability, reinforcing its importance in maritime navigation.