Final answer:
Vehicles are generally prohibited from passing a stopped school bus that is picking up or dropping off students due to safety concerns. Traffic laws require vehicles to stop when a school bus's stop sign arm is extended and red lights are flashing.
Step-by-step explanation:
The question 'How fast can you pass a bus picking up or dropping off students in front of the school?' touches upon the real-world application of physics concepts relating to motion, velocity, and safety regulations. In general, the guidelines for passing a school bus depend on the local traffic laws, which usually prohibit passing a stopped school bus that is picking up or dropping off students due to the concern for the safety of the students. When the bus's stop sign arm is extended and red lights are flashing, vehicles must stop and may not pass the bus. This law is to protect children as they enter and leave the bus, and passing speed is not relevant as passing should not occur.