Why must passenger bus drivers maintain exceptionally smooth acceleration, gear shifting, and progressive deceleration rather than aggressive driving dynamics?

1. Buses carry high centers of gravity and unrestrained/standing passengers whose inertia during abrupt braking or swerving causes severe fall injuries
2. Aggressive acceleration causes the bus engine transmission to automatically lock into reverse gear
3. Smooth driving is only required when transport management bureau inspectors are physically onboard the coach
4. Sudden braking reduces pneumatic air tank pressure to zero within three seconds, permanently disabling the steering wheel