Which statement about egress velocity is correct?

Which statement about egress velocity is correct?

• A. It is a fixed value regardless of occupancy.
• B. It depends on occupant load and protection features.
• C. It depends only on ceiling height.
• D. It has no impact on corridor design.

Answer: (B)

Egress velocity reflects how fast people can move during an evacuation, and it isn’t a fixed number. It changes with how many people are evacuating (occupant load) because crowd density affects the pace at which individuals can safely travel. It also depends on protection features that shape the evacuation environment—such as smoke control, fire barriers, and automatic sprinklers—which influence visibility, heat, and overall safety. When occupant load is higher, the design must account for the increased potential flow and the need to keep movement smooth and unimpeded; protection features help maintain conditions that allow people to reach safety at the intended rate, affecting the required egress velocity and the design of the corridors and exits. Ceiling height on its own doesn’t set egress velocity, and egress velocity does impact corridor design because the corridor width, number of exits, and travel paths are sized to accommodate the expected flow of people at the appropriate velocity.

Egress velocity reflects how fast people can move during an evacuation, and it isn’t a fixed number. It changes with how many people are evacuating (occupant load) because crowd density affects the pace at which individuals can safely travel. It also depends on protection features that shape the evacuation environment—such as smoke control, fire barriers, and automatic sprinklers—which influence visibility, heat, and overall safety. When occupant load is higher, the design must account for the increased potential flow and the need to keep movement smooth and unimpeded; protection features help maintain conditions that allow people to reach safety at the intended rate, affecting the required egress velocity and the design of the corridors and exits.

Ceiling height on its own doesn’t set egress velocity, and egress velocity does impact corridor design because the corridor width, number of exits, and travel paths are sized to accommodate the expected flow of people at the appropriate velocity.