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

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

Answer: (D)

Engineering controls are physical features or devices designed to reduce exposure to a hazard without depending on people to act. The “laser on” light outside the lab door fits this idea: it’s a signaling device tied to the laser’s status that provides a visible warning when the laser is active, helping to prevent accidental exposure by alerting people and guiding entry decisions. It works by altering the environment around the hazard rather than relying on individuals to wear protection or follow procedures alone.

Goggles for laser protection are personal protective equipment, which relies on the user to wear them. Safety training and an operations manual are administrative controls, aiming to influence behavior and procedures rather than change the physical hazard.