What is a crucial practice when operating a bus during inclement weather?

Allowing additional stopping distance is vital when operating a bus during inclement weather due to the reduced traction and increased stopping distance that comes with wet, icy, or snow-covered roads. Wet and slippery surfaces can significantly decrease the effectiveness of braking systems, meaning that even if a driver applies the brakes, the bus may continue moving for a longer distance than it would in dry conditions.

By increasing the following distance and allowing for extra space to stop, drivers can better react to changes in traffic and road conditions, minimizing the risk of accidents. This practice also applies to maintaining control over the vehicle while navigating turns or dealing with sudden stops from other vehicles, ensuring both the safety of the driver and the passengers.

The other options do not promote safe driving practices under poor weather conditions. Maintaining regular speed can endanger both the driver and passengers by not accounting for the slower reaction and stopping times required in hazardous conditions. Using high beams can sometimes cause glare and worsen visibility in heavy rain or snow, rather than improving it. Encouraging passengers to remain calm is important for maintaining a safe environment but does not directly influence the driver's ability to control the bus under dangerous conditions.