What defines the function of a layover for a bus driver?

A layover for a bus driver is primarily defined as a break between routes. During a layover, the driver has time to rest, prepare for the next trip, and ensure the bus is ready for service again. This period is crucial for maintaining the safety and efficiency of transit operations, allowing the driver to recuperate before embarking on the next route.

While loading and unloading passengers is an essential part of bus operations, it is not specifically what defines a layover. Additionally, while refueling may occur at certain points during a driver's shift, it isn’t an inherent reason for a layover. Lastly, a gap in the bus schedule could refer to timing or schedule adjustments and does not specifically define the function or purpose of a layover for drivers. Thus, recognizing that a layover is fundamentally a break between routes helps clarify why this is the correct answer.