What is the function of a safety vest worn by bus drivers?

The function of a safety vest worn by bus drivers is to enhance visibility and safety when outside the bus. These vests are typically made of bright colors and have reflective strips, making the driver more visible to other motorists, especially in low-light conditions or during inclement weather. This increased visibility is crucial for the safety of both the driver and any students who may be boarding or disembarking from the bus.

While keeping the driver warm may seem beneficial, a safety vest's primary purpose centers around visibility rather than thermal insulation. Showing authority is not a direct function of the vest, as it is more about safety than command. Reducing fatigue does not relate to the vest's purpose either; rather, it's an accessory aimed at improving safety in outdoor situations.