What is a characteristic feature of MacPherson strut suspension?

A characteristic feature of MacPherson strut suspension is that it effectively integrates the upper strut mount and lower control arm into a single unit. This design simplifies the suspension layout, allowing for a more compact setup compared to other suspension types. By combining these components, the MacPherson strut not only supports the weight of the vehicle but also provides a pivot point for steering, enabling efficient use of space under the hood and improving vehicle handling dynamics.

The integration seen in the MacPherson strut system is key to its popularity in many modern vehicles, especially compact cars. This allows for reduced manufacturing complexity and potentially lower production costs, while still delivering performance and reliability.

In contrast, other options describe features that do not align with the fundamental design of the MacPherson strut. For instance, a design that utilizes multiple control arms reflects a more complex suspension structure rather than the single-unit approach of the MacPherson strut. The mention of air springs suggests a different kind of suspension method, which is not specific to the MacPherson strut design. Additionally, the requirement of a separate shock absorber and spring does not apply to this type of suspension, as the strut system incorporates both.