Under what circumstances is it permissible to pass a school bus?

The correct response highlights that passing a school bus is permissible only when it is not actively loading or unloading children and its warning lights are turned off. This regulation is in place to ensure the safety of children who may be crossing the street to board or exit the bus. The warning lights serve as an indication that children are present, and thus, passing the bus in that scenario would pose a significant risk to their safety.

By ensuring that the bus is both not engaged in loading or unloading and has no activation of warning signals, drivers can safely pass without endangering children or violating traffic laws. Observing these guidelines helps maintain a safer roadway environment, particularly in the vicinity of schools where children are often present.