What is the primary function of a vehicle's suspension system?

The primary function of a vehicle's suspension system is to support the vehicle's weight. This system plays a crucial role in maintaining the proper ride height of the vehicle and ensuring that the vehicle's load is properly distributed across all four wheels. By supporting the weight, the suspension system helps to keep the tires in contact with the road, which is essential for handling, stability, and overall vehicle safety.

In addition to supporting weight, the suspension system also absorbs shocks from road irregularities, which contributes to passenger comfort and vehicle control. A well-functioning suspension system supports the vehicle's structure while minimizing the impact of bumps and dips in the road, thereby enhancing the driving experience.

The other options, while related to vehicle performance, do not represent the primary role of the suspension system. Fuel efficiency, engine performance, and wind resistance are influenced by other systems within the vehicle, such as the powertrain or aerodynamic design, rather than the suspension itself.