What does the practice of curbing involve in bus operations?

Curbing refers specifically to the action of stopping the bus alongside the curb at designated bus stops. This practice is essential for ensuring passenger safety and ease of boarding and alighting. It allows passengers to enter and exit the bus safely without having to navigate through traffic. Proper curbing requires drivers to skillfully maneuver the vehicle close to the curb while maintaining awareness of surrounding traffic and pedestrians.

While navigating around sharp turns, monitoring speed limits, and checking mirrors frequently are all important aspects of safe bus operation, they do not capture the specific meaning of curbing in relation to bus stops. The emphasis on stopping at the curb is fundamentally tied to the goal of providing safe and efficient service for riders, making it the accurate answer in this context.