Abstract: An air bag deployment system includes a pre-impact sensor operative to detect an imminent impact and at least one post-impact sensor operative to detect an impact. An air bag has a non-deployed volume, a pre-impact deployed volume, and a post-impact deployed volume smaller than the pre-impact deployed volume. The air bag is deployed to the pre-impact volume wherein the air bag deployment system is arranged to deploy the air bag before the impact and the at least one air bag is deployed into the pre-impact deployed volume, in reaction to the imminent impact, and to the post-impact deployed volume in reaction to the impact. The system provides for enhanced occupant safety during a collision by allowing pre-impact deployment of the air bag in order to utilize the full possible length of deceleration for the occupant as the impact pulse affects the occupant.