What is the correct procedure for operators upon completing their route before a scheduled departure?

Turning off the bus while waiting after completing a route before a scheduled departure is the appropriate procedure. This not only conserves fuel but also reduces emissions and noise, which aligns with environmental practices and policies that many transit organizations adopt.

Given that operators are often encouraged to minimize unnecessary idling, turning off the engine during waits helps promote energy efficiency and sustainability within the transit system. Furthermore, it enhances safety by reducing the risk of accidental movement of the vehicle when idling.

The other options may not conform to best operational practices; for example, keeping the engine running can contribute to excess fuel consumption and pollution. Driving to a rest area may not be viable if the bus is not scheduled to leave immediately, and filling out a report might be necessary for documenting routes or incidents but is not directly related to the waiting procedure after completing the route.