What does the term "bus kneeling" refer to?

The term "bus kneeling" specifically refers to the feature that lowers the front end of the bus to curb level. This is typically achieved by lowering the air suspension system on the bus, which allows passengers easier access when boarding or alighting, especially for those with disabilities or mobility challenges. By bringing the bus down to meet the curb, it reduces the height difference that would otherwise require individuals to step up or down significantly, thereby enhancing accessibility and safety for all passengers.

The other options, while related to bus functionality, do not specifically define "bus kneeling." For example, the ability to tilt for easier boarding describes a different mechanism and does not capture the essential feature of lowering to curb level. Adjusting seating height pertains to internal accommodations and does not relate to access from the curb. A safety feature for emergency exits, while important, does not connect to the primary purpose of the "kneeling" function, which focuses on facilitating boarding and alighting.