Evacuation time curves influence egress design by determining which elements?

• A. The materials used for interior finish.
• B. The placement of structural supports.
• C. Travel distances, number of exits, and required fire protection features to ensure safe egress within a given time.
• D. The color scheme of exit signage.

Answer: (C)

Evacuation time curves set the time window that must be available for people to reach a safe location during a fire, and they guide how the egress system is designed to meet that window. They directly determine what travel distances are acceptable, how many exits are needed and where they should be located to provide alternative routes, and what fire protection features must be in place to keep conditions tenable long enough for evacuation (such as fire-rated assemblies, automatic sprinklers, detection, and smoke control). If the curve shows egress could take too long, you adjust by reducing travel distances, adding or better locating exits, and enhancing protective measures to extend the safe egress time. Interior finishes or signage color don’t set the egress timing in the same way, so they don’t drive the evacuation time curve itself.