Oh, what a horrible experience! I had a boyfriend, in his 50's, tall and "large" and he slipped on ice and fell under a truck that was turning a corner in downtown Washington, D.C. and only onlookers banging for all their worth on its sides to get the driver's attention stopped it before it went over him. I remember his telling me about the experience the night it happened, over and over and his obvious shock at how small and helpless it could make him feel and my realizing that personal "size" was no help, being "big and strong," etc. had no influence at all. I can't imagine personally living with that knowledge daily with it in the forefront of my awareness.