The location, number and dimensions of doors and gates, and the materials used, are determined by the nature and use of the work premises or areas.Doors for pedestrians must be provided in the immediate vicinity of gates primarily intended for vehicle traffic, except where it is safe for pedestrians to use such gates. Such doors must be clearly marked and must never be blocked.Doors must not be placed under openings for vertical movement of goods.Doors and gates with glass panels or that are transparent must be secured against breaking and be fitted with satisfactory warning marks at eye height.Swing doors and gates must be designed so as to avoid collisions.It must be possible to open mechanical doors and gates manually at all times.Doors and gates must be fitted with safety systems if shutting them accidentally entails danger. Mechanical doors and gates must function in a manner that does not expose employees to danger. They must be fitted with easily recognisable and accessible shut-down devices.Sliding doors must be fitted with a safety device to prevent them from being derailed or falling over.