What is the purpose of side air bag inflatable curtains?

Side airbag inflatable curtains are designed primarily to provide added head protection for occupants in the event of a side impact collision. These curtains deploy from the roof area of the vehicle and create a protective barrier that can help to minimize the risk of head injuries by preventing the occupant's head from striking the vehicle's interior or any external objects, such as other vehicles, during a side crash.

In contrast, the other options refer to different safety features or purposes related to vehicle safety. Cushioning the body during frontal collisions is the role of frontal airbags, not side curtains. Keeping passengers securely in place is typically managed by seat belts and child restraints, while reducing cabin noise is a matter of vehicle design and materials, not related to airbag functions. Thus, the effectiveness of side airbag inflatable curtains in enhancing occupant safety during side impacts is their most critical and recognized purpose.