What does 'unibody construction' refer to in vehicles?

Unibody construction refers to a structural design in which the body and the frame of a vehicle are integrated into a single piece. This means that the vehicle's body supports the overall structure instead of relying on a separate frame. This design enhances the rigidity of the vehicle, improves safety by allowing for more effective crumple zones, and often results in a lighter vehicle which can improve fuel efficiency.

The unibody approach contrasts with traditional body-on-frame designs where the body is mounted on a separate frame. This modern method of construction is commonly found in a majority of passenger vehicles today, as it allows for more efficient use of materials and space. Unibody construction applies universally across various types of vehicles, not just specific categories like trucks, and has implications for both safety and performance rather than purely aesthetic considerations.