What is the function of the run lock system?

The function of the run lock system is to allow the engine to run without the need for an ignition key. This system is particularly useful in emergency response vehicles, such as ambulances, where quick access to a running engine is necessary for operational readiness. The run lock feature enables the engine to remain operational while personnel attend to patients or perform necessary tasks without the constant need to insert or turn a key. This can enhance efficiency during critical situations where time is of the essence.

The other options describe functions that are not associated with the run lock system. Preventing engine overheating is typically managed by the vehicle’s cooling system, automatically stopping the engine when parked refers more to safety features in some modern vehicles, and enhancing fuel efficiency involves various engine and driving techniques rather than being linked to the run lock feature.