What type of frame is currently used in most sedans?

[McBarrett]

Currently, most sedans adopt a unibody construction. The unibody does not have a separate frame; instead, the body itself serves as the mounting base for the engine and various chassis components, functioning as the frame while bearing all loads. Additional Information: Advantages and Disadvantages of Unibody Construction: 1. Advantages: 1. Lightweight with excellent overall bending and torsional rigidity. 2. Low cabin floor height, resulting in compact vehicle height dimensions. 3. Primarily uses sheet metal processing and spot welding, facilitating mass production. 2. Disadvantages: 1. Road and engine noise/vibrations are more easily transmitted into the cabin. 2. Since the entire body ensures structural rigidity, modifications are challenging.