What principal function of the suspension system allows the wheels to maintain contact with the road?

The principal function of the suspension system that allows the wheels to maintain contact with the road is primarily about absorbing shocks and vibrations. This function is vital because the road surface is rarely perfectly smooth; it consists of bumps, dips, potholes, and other irregularities. When a vehicle is in motion, these imperfections can cause the wheels to lose contact with the ground if the suspension system does not adequately absorb the forces acting on the vehicle.

By effectively managing and dissipating those shocks and vibrations, the suspension keeps the wheels in contact with the road surface for improved grip and stability. This direct contact ensures better handling, traction, and overall safety while driving. In contrast, other options, while important, do not directly address the ability of the wheels to stay in contact with the road under varying conditions, which is crucial for vehicle performance and safety.