This online Struck-By Hazards in Construction Environments course provides the information employees need to recognize the struck-by hazards that are associated with construction tasks and take steps to avoid them before accidents happen. Struck-by accidents occur when a person is hit by a moving object. On construction sites this can include being hit on the head by a falling hammer, hit by particles being thrown from a grinder, hit by a truck that's backing up, or hit by a load of wallboard that's being hoisted. Struck-by accidents are one of the four top causes of fatalities in construction work, and can result in serious injuries as well. But they don't have to happen.