What should the sign stating "IN CASE OF FIRE, USE STAIRS UNLESS OTHERWISE INSTRUCTED" be posted?

The appropriate placement for the sign stating "IN CASE OF FIRE, USE STAIRS UNLESS OTHERWISE INSTRUCTED" is at the elevator landing. This location is critical because, during a fire emergency, elevators can malfunction or become dangerous to use due to smoke or fire conditions. Posting the sign at the elevator landing ensures that individuals are immediately informed of alternative evacuation routes when they are most likely to be thinking of using the elevator. This reinforces the importance of using the stairs, which are designed as a safe means of egress in emergencies.

While other locations like stairwell doors, cubicles, or hallways could be considered for safety signage, the elevator landing is particularly strategic since it directly addresses the common temptation to use elevators during an emergency, thereby providing clear guidance at a critical decision point in the evacuation process.