The history of accessibility on London's transport network.

A kneeling bus is a bus that not only has no steps between the door and the bus floor, but also has an air-adjustable suspension. This feature allows the driver to actually lower the bus to the curb to make entering and exiting the bus much easier. 

Along with the air-lift system, the kneeling bus has no stairs or steps on the interior of the bus to impede traffic. Passengers who use wheelchairs as well as any passenger who may have an impediment which makes climbing steps on a conventional bus difficult can navigate the entrance of a kneeling bus much easier than a traditional bus. Typically, the doors and aisles of a kneeling bus are also wider than the same areas in a standard bus, making access much easier for the handicapped.