Abstract: A side impact detection system for detecting information about a side impact of a vehicle. The side impact detection system comprises a elongated member, a detection sensor, a deriving unit, and a determination unit. The elongated member is capable of being deflected toward the inside of the vehicle according to the deformation of the door outer panel in the event of a side impact. The detection sensor detects information about the displacement of a setting area that is previously set on the elongated member during the deflection of the elongated member toward the inside of the vehicle. The deriving unit derives the displacement and the displacement speed of the setting area relative to a vehicle body side member based on the information detected by the detection sensor. The determination unit determines the mode of the side impact on the vehicle based on the information derived by the deriving unit.

Abstract: An inflatable seat belt apparatus is formed of an inflatable portion which is usually maintained in a band shape and has an envelope part inflated and deployed in a spindle shape by introducing a gas generated by a gas generating device, the gas generating device acting in case of exceeding a predetermined threshold, a webbing having the inflatable portion extending over at least a range directly contacting with an occupant, a tongue fixed to an end of the inflatable portion and having a gas inlet from the gas generating device inside thereof and a buckle which detachably engages the tongue. The envelope part is made of a knitted fabric expanded in the weft direction in a range of contacting the chest of the occupant when the envelope part is inflated. The inflatable seat belt apparatus includes an inflation restricting device for restricting the expansion in the weft direction besides the range.