Airbags are generally installed in three directions: the front of the car (the driver's seat), the side (the front and rear rows of the car) and the roof. The words Supplemental Inflatable Restraint System (SRS) are printed on the outside of the container equipped with the airbag system, which should be literally translated into Chinese and should be "auxiliary inflatable restraint system". It is designed to reduce the injury degree of the occupants in a secondary collision due to inertia after a car collision.