What is the safest practice regarding using mirrors when driving a bus?

MIRROR USE ON BUSES: Effective mirror use is essential for bus drivers. PRACTICE: Check mirrors REGULARLY and FREQUENTLY (quick glances every few seconds) to monitor: traffic alongside and behind; the sides and rear of the bus (large vehicle, many blind spots); passenger activity at the doors during boarding/exiting; the rear during lane changes and turns; DON'T STARE: Quick glances, not prolonged looks — attention must stay primarily on the road ahead; BLIND SPOTS: Buses have significant blind spots; mirrors (and proper adjustment) help, but the driver must still be cautious of areas mirrors don't cover; ADJUSTMENT: Adjust mirrors properly before the trip (part of pre-trip); BOARDING/EXITING: Use mirrors to ensure passengers are clear before closing doors and moving; TURNS/LANE CHANGES: Check mirrors to track the rear of the bus (off-tracking) and adjacent traffic; the combination of a large vehicle, many blind spots, and passenger activity makes systematic, frequent mirror checks essential for bus drivers; proper mirror use — frequent quick glances while keeping primary attention forward — is a fundamental safe-driving skill emphasized for passenger vehicles.