The danger-sensing driver's seat

Today's carmakers boast of their new vehicles' cocoonlike qualities, including the latest noise-reducing features and great shocks that smooth out those bumps on the road. Myriad warning alarms are designed to counteract the insular environment when there's trouble, but Yale University engineers are looking for a more subtle approach to signaling: vibrating motors and movable cams that send signals straight from the seat back to your back.