We developed the world's first "motorcycle airbag system" for mass produced motorcycle in order to reduce injury to the rider when a motorcycle experiences a frontal collision.This "airbag system for motorcycle" is made up of three components: an airbag module which stores the airbag itself and the inflator which supplies air for bag inflation, acceleration sensors which sense impact, and an airbag ECU (Electric Control Unit) which executes the computation process for collision detection. In the event of a frontal collision, 4 acceleration sensors attached to the front fork sense the impact acceleration and deliver that acceleration data to the airbag ECU, wherein the airbag ECU instantaneously determines whether or not to release the airbag based on that data.When bag release is determined to be necessary, a spark current is sent to the inflator wherein the inflator responds instantaneously, generates air for airbag inflation, and inflates the airbag itself. By absorbing the forward moving kinetic energy of the rider and controlling the speed of separation from the motorcycle, the airbag, which inflates in an extremely short period from the point in time wherein the acceleration sensors sense the impact acceleration, reduces injury to the rider caused by impact into objects such as other vehicles and the road surface.