Advances in two wheeler rider safety have not kept pace with that of automobile rider safety. One of the safety systems in consideration, of late, has been deployment of airbags [Ijima etal, 1998] . Some of the limitations perceived in deploying airbags are that two wheeler riders are less likely to be in a fixed location with respect to the airbag at the point of impact and the lack of a supporting surface. The nature of these impacts has been analysed in simulation for a proposed airbag system to estimate the head accelerations when the initial contact with the airbag is during the deployment phase.