Defined in the 'Disability Discrimination Act' 1995. This is where the vehicle is designed to be fully accessible for disabled passengers. Features include illuminated destination displays, kneeling suspension that lowers the body of the vehicle closer to the ground, fitted with a lift/ramp for wheelchair access and suitable space for at least one wheelchair user.
This is where the vehicle has air adjustable suspension that lowers the body of the vehicle closer to the ground making entering/exiting the vehicle much easier.
This is where the vehicles stability is improved by detecting and reducing loss of traction by applying brakes to wheels individually.