The Occupational Safety and Health Administration (OSHA) has identified the most common fatal construction accidents, known as the "Big Four." These are:
Falls from heights
Struck/hit by something at the work site, such as falling tools, equipment, building supplies or swinging beams, pipes and other crane-carried material, and construction vehicles
Caught in between something moving and an unmoving object; examples include being pinned to a wall by a vehicle or motorized construction equipment or being pinned by a collapsed wall or construction material, or being crushed when a scaffold collapses.
Electrical hazards that include coming into contact with power lines, power tools with defective cords, wiring and switches, improperly grounded outlets, and temporary wiring.