To run the HVAC system. A bus is a very large area to heat or cool and it takes a long time to get it to temperature. Customers don't want to enter and ride a bus that is uncomfortably hot or cold.
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Some drivers let the bus idle because they're worried customers won't like the heating or air-conditioning temporarily turning off (assuming the bus doesn't have idling reduction technology). But most of the time, the bus cabin will easily maintain a comfortable temperature for the time it takes to load and unload.
The main reasons a driver would choose to leave their truck's engine on are to: Regulate the temperature inside the cab when it's extremely hot or cold outside. Prevent the battery from dying. Keep the engine warm for their next trip.
Opening the doors serves as a safety precaution to enhance visibility and auditory awareness for both the driver and passengers. By opening the doors, bus drivers can better hear any approaching trains and have an unobstructed view of the tracks.
Most likely they are early - ahead of the timetable. Most bus networks have 'time points' along routes, where the drivers must wait until the correct departure time if they are early.
A school bus is most likely to be bouncy due to the air suspension working as well the axle. Charter buses are air suspension but feel like you are air riding because the seats are raise higher from the suspension and the axle. This makes the bus ride more comfortable on long rides and when going on bumpy roads.
School buses are equipped with a passive restraint system called compartmentalization that means that the seating area of a school bus is built with specially padded high-back, wider, thicker seats that protect students in school buses during accidents.
If you are waiting at a bus stop and the bus drives past, it is likely it has reached its reduced seating capacity. If the bus does stop, but is near capacity, the driver will only allow one person to board for every person that gets off, so you may need to allow extra time for your journey and be prepared to wait.