Which type of vehicle construction uses a frame only in areas requiring extra support and a strong attachment?

The type of vehicle construction that uses a frame only in areas requiring extra support and a strong attachment is known as a "frame-reinforced" or "semi-monocoque" design. This approach combines a lightweight monocoque structure with strategically placed frame elements to enhance strength and rigidity where needed, while keeping the overall weight of the vehicle lower. This design is commonly found in modern automobiles and some aircraft to optimize performance and efficiency.