Seat Belts for Backseat Passengers

Ford announced it will offer seat belt airbags for backseat passengers.
The airbags will be sewn into the shoulder portion of the rear seat belts – and will deploy outward and sidewise, like a small tubular pillow. Ford says these seatbelt airbags deploy more slowly and with much less force than frontal airbags. That, they say, makes it safe for a rear seat occupant, from a young child to an elderly passenger.
Ford Announces Airbags for Backseat Passengers - ABC News