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Why is maximum egress distance and not queuing time considered for planning the number of stairways in a building?

Question asked by on Sep 19, 2018
Latest reply on Sep 21, 2018 by jsisco

Generally, maximum egress travel path is considered to arrive at the number of stairways in a building. However, queuing time(tq) in front of exit stairway doors in each floor is more critical as it is greater than the time taken for horizontal distance (exit travel path) movement on a floor(td). So why do we not consider tq for the number of stairways required.

Or, put in another way - why is travel distance not added to queuing time in egress calculations.