Which best describes unibody construction?

• A. The body and frame are constructed as one unit
• B. The frame is separate from the body
• C. The body is made of composite only
• D. The vehicle uses a spaceframe

Answer: (A)

Unibody construction means the vehicle’s body and its structural frame are one integrated shell. The body panels, floor, pillars, and rails all work together to provide rigidity and carry the loads, so there isn’t a separate, distinct frame that the body sits on. This integration helps reduce weight and improve crash energy management because the whole shell participates in supporting stresses.

This differs from a body-on-frame design, where a separate frame carries most of the load and the body is mounted onto it. A spaceframe refers to a lattice-like structural framework, not a single integrated shell. The material of the body being composite versus metal isn’t what defines unibody, since unibody can use different materials while still being one integrated structure.