What does an automatic cut-off lanyard do when properly attached to a PWC operator?

When properly attached to a personal watercraft (PWC) operator, an automatic cut-off lanyard serves a critical safety function by stopping the engine if the operator falls overboard. This mechanism is designed to prevent the PWC from continuing to operate out of control, which could pose a danger to the operator and anyone nearby. The lanyard is typically connected to the operator's person, so if they are thrown from the PWC, the lanyard pulls off the ignition key or an electronic cutoff, thereby halting the engine immediately.

This safety feature is essential in preventing accidents and injuries that could result from an unattended PWC or the operator being in the water while the craft remains in motion. The other choices do not accurately describe the function of the automatic cut-off lanyard, as it does not increase engine power, activate warning signals, or control speed limits.