In the FD role at MVC, the size-up process includes which of the following?

• A. Inner and outer circles
• B. Primary and secondary circles
• C. Hazard and control zones
• D. Core and peripheral circles

Answer: (A)

Two concentric circles are used in MVC size-up to rapidly organize actions and safety. The inner circle centers on the vehicle and the occupants, guiding immediate operations such as vessel stabilization, disconnecting power if possible, preventing movement that could injure or trap someone, and establishing a clear path for patient access and potential extrication. The outer circle encompasses the surrounding scene, focusing on scene safety, traffic control, bystander management, and protection of responders while work is conducted. This larger perimeter helps secure a safe working area, set up a staging area for equipment, and coordinate with other responders and EMS.

Other terms don’t reflect the standard two-circle approach used in this context. Primary/secondary circles, hazard and control zones, or core and peripheral circles don’t align with the established MVC size-up terminology, even though assessing hazards and establishing safe zones are part of the process. The inner/outer circles framing conveys the correct method for rapid, organized assessment and action during the incident.