A motorcycle crash on the San Mateo-Hayward Bridge three years ago catapulted Manuel Abad over his handlebars. He landed hard on the roadway and lay there fully conscious, certain rush-hour traffic would run over him. "I knew I was going to die," he said. Instead, he survived -- not only the oncoming cars but also the serious neck, limb and internal injuries he suffered. On Saturday Abad, 56, joined two dozen other trauma survivors at a gathering with paramedics and Stanford University Hospital doctors, nurses and other staff members who saved their lives.