What is the function of the lanyard attached to a PWC's ignition safety switch?

The lanyard attached to a personal watercraft (PWC) ignition safety switch serves an important safety function by connecting the operator to the safety switch. When the operator wears the lanyard attached to them, it ensures that if they fall off the PWC or are thrown from it, the lanyard will pull away from the switch and automatically shut off the engine. This prevents the PWC from continuing to operate without a rider, reducing the risk of injury or accidents that could occur from an unmanned craft. This design is a critical safety measure meant to enhance the overall safety of operating a PWC.

The other options do not align with the function of the lanyard. While preventing the engine from running is related in a way as it does help stop the engine if the operator is ejected, the specific role is more about maintaining a direct connection between the operator and the safety mechanism. The lanyard does not enhance speed, nor does it have any influence on fuel efficiency.