Roof Rail Airbag Including a Variable-Length Tether Attaching an Edge of the Roof Rail Airbag to a Vehicle Body Structure

An airbag assembly according to the present disclosure includes an airbag cushion and a first tether. The airbag cushion is configured to be stored in a roof of a vehicle when the airbag cushion is uninflated. The airbag cushion is configured to at least partially cover an opening in a sidewall of the vehicle when the airbag cushion is inflated. The first tether is coupled to a forward edge of the airbag cushion at a first location. The first tether is configured to be coupled to a body of the vehicle at a second location. A length of the first tether between the first and second locations is configured to vary as the airbag cushion is deployed.