Definition of egress?Definition of egress?:
The action of exiting

While a reduction in visibility is not directly life-threatening, it does reduce the walking speed of individuals, thereby increasing the exposure time to toxic gases and elevated temperature. In addition, the reduction in visibility may lead to an increased susceptibility to occupants tripping or falling. The relationship between visibility and movement speed is indicated in the figure below [Klote and Milke, 1992Klote and Milke, 1992:
Klote, J.H., and Milke, J. A. (1992), Design of Smoke Management Systems, American Society for Heating Refrigeration and Air Conditioning Engineering, Atlanta, GA, 1992.].

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