What must a bus do at railroad crossings outside of business districts?

A bus must stop at railroad crossings outside of business districts unless directed otherwise by a law enforcement officer. This requirement is in place to ensure the safety of passengers and the bus driver, as well as to prevent accidents at potentially dangerous intersections. Stopping provides the opportunity to look and listen for oncoming trains, which may not be immediately visible. The regulations are designed to minimize risks associated with rail traffic, particularly since buses typically transport many passengers and need to ensure their safety.

While some scenarios might indicate that a bus could proceed without stopping if the tracks are clear, or that there are different considerations when passengers are not aboard, the law prioritizes the safety protocols that mandate stopping. This applies indiscriminately at crossings, making option B the most appropriate action for drivers of buses at such locations.