What is a direct benefit of using seat belts discussed in vehicle safety standards?

Using seat belts significantly reduces the chance of a head or face strike to the steering wheel during a collision or sudden stop. This is a crucial aspect of vehicle safety, as it helps to prevent severe injuries that could occur if the occupant is thrown forward in a crash. Seat belts restrain the occupant's movement, allowing their body to decelerate more gradually with the vehicle rather than being forcefully propelled against the steering wheel or dashboard.

In contrast, the other options do not relate to the primary function of seat belts and their direct impact on occupant safety during an accident. For instance, improvements in engine performance or visibility are unrelated to the physical protection provided by seat belts, as they pertain to different aspects of vehicle operation and design. Additionally, reducing road noise is more about comfort and sound insulation rather than safety, which is the primary focus when discussing the benefits of seat belts.