Which is an example of an engineering laser safety control measure?

• A. Laser on light outside lab door
• B. Goggles for laser protection
• C. Safety training for staff
• D. Operational procedures manual

Answer: (A)

Engineering controls are physical features added to the workplace or equipment that reduce exposure to hazards without relying on individual behavior. A warning light outside the lab door that signals when the laser is on is a physical safety feature that communicates hazard status and helps prevent accidental exposure by prompting people to avoid entering or to take precautions. It reduces risk at the environment level, not by personal protection or by telling people what to do.

Goggles provide protection after exposure is possible (PPE), while safety training and a procedures manual influence behavior or procedures (administrative controls). The warning light represents a built-in safety feature of the space, fitting the engineering control concept.