The architectural use of glass in buildings and building structures may create risks to safety if the hazards associated with its use are not recognised and controlled. In addition to the risks from breakages and broken glass, glass doors and walls can become ‘invisible’. Injuries have been caused when people have walked or driven into these 'invisible' walls. Employers health and safety duties extend to considering the risks from the glass used in the workplace building so that reasonably practicable measures can be used to ensure the safety of workers and others. Detailed for glazing standards, the specifications for glass vary with the surface area of the window, door or wall, can be found in British Standards 8213 and 6262-4; the standards also provide advice and information about the construction of and marking glass partitions and transparent and translucent walls in rooms near or adjacent to workstations or a traffic routes to prevent people from coming into contact with the walls or being injured should the walls shatter.