 This allows the floor to be lowered when the bus is stopped, to allow people with large or bulky luggage, passengers with disabilities, or simply when stopping at stops with unusual curb arrangements to enter or exit the vehicle easily.It can also raise the bus more than normal, which is useful when navigating roads with large amounts of speed humps, crossing railway lines or in other unusual, but not always uncommon situations.Adjustable suspensions have become intrinsically associated with lowrider vehicles.