With your safety in mind, the IS interior is filled with an array of airbags  to help protect you and your passengers during different types of collisions. There are driver’s and front passenger’s knee airbags, front seat-mounted side airbags, and side curtain airbags. The driver’s and front passenger’s system utilizes dual-stage airbags that are designed to inflate at two different speeds depending on the severity of impact. The driver's airbag system takes into account the distance between the steering wheel and the front seat in determining the speed of deployment. The IS also comes equipped with a twin-chamber airbag for the front passenger. The SRS twin-chamber airbag deploys with a slight depression in its center. This is designed to help disperse the forces applied to the passenger immediately after deployment.