Why should a driver periodically scan mirrors for standing passengers who might be losing their balance, even mid-route?

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1. Mirror scans for passenger balance are relevant only on stairs, not standard aisles, since a level aisle floor is assumed to be stable enough
2. Standing passengers never lose balance once the vehicle reaches cruising speed
3. This check is necessary only during the first five minutes of a trip
4. It allows the driver to notice a developing problem and adjust driving smoothly before it results in a fall

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