ONLINE VERSIONAppendix AARamp A slope steeper than 1:20, on which a pedestrian or wheelchair user can move from one level to another (see Section 2).Rise The height between consecutive treads (see paragraphs 1.2 and 1.3). For ramps: the vertical distance between each end of the ramp flight.Spiral stair A stair in a helix around a central column (see paragraph 1.28). Stair width The clear width between the walls or balustrades.Tapered tread A step in which the going reduces from one side to the other (see paragraphs 1.25–1.27).Transverse gangway A flat gangway parallel to the rows of seating/wheelchair spaces.Utility stair A stair used for escape, access for maintenance, or purposes other than as the usual route for moving between levels on a day-to-day basis.Vomitory exits Storey exits provided within the body of a seating layout.52 t K, 2013 edition t K, 2013 edition t K, 2013 edition Approved Document K, 2013 edition Building Regulations 2010ONLINE VERSIONONLINE VERSIONONLINE VERSION