What must drivers continuously monitor during the loading and unloading process?

During the loading and unloading process, it is crucial for drivers to continuously monitor their mirror views. This practice ensures that the driver can observe the surrounding environment and any pedestrians, particularly children who may be boarding or exiting the bus. By using mirrors effectively, drivers can maintain awareness of potential hazards that may not be directly in front of them, allowing for safer interactions with students and preventing accidents.

Other options, while relevant in different contexts, do not concentrate specifically on the immediate safety concerns associated with loading and unloading. For instance, while weather conditions can indeed impact driving safety, they are not as critical during the specific moment of loading or unloading. Sound signals can alert others but are not something the driver monitors continuously in the same direct manner that mirrors provide. Monitoring vehicle speed is also important, but when it comes to the loading and unloading process, the focus should primarily be on visual awareness through mirrors to ensure children's safety.