What are the main causes of injuries when using forklifts?
The main causes of forklift injuries are tip-overs (overturns), striking or crushing pedestrians, falling loads, workers falling from the forklift, and driving off loading docks. Overturns are the single deadliest cause, usually driven by inadequate training, overloading, speeding, and poor visibility.
The main causes
Forklift injuries cluster into a handful of repeating patterns, and knowing them is the whole point of OSHA's powered-industrial-truck standard (29 CFR 1910.178). The big five are:
- Tip-overs / overturns. The forklift rolls onto its side or forward. This is the number-one cause of forklift fatalities. It happens when the combined center of gravity of the truck and its load moves outside the vehicle's stability triangle — from turning too fast, traveling with a raised load, driving on a slope incorrectly, or lifting a load whose center is too far forward.
- Struck-by / crushing of pedestrians. A forklift hitting a worker on foot, or pinning them between the truck and a wall, rack, or another vehicle. Poor visibility (large loads block the view) and blind intersections drive these.
- Falling loads. Loads that are unsecured, unbalanced, stacked too high, or lifted on damaged pallets fall onto the operator or nearby workers.
- Falls from the forklift. Riders on the forks, or workers elevated on forks without a proper work platform, fall.
- Driving off a dock or into a trailer that moves. A truck runs off the edge of a loading dock, or drives into a trailer that rolls away because it wasn't chocked or restrained.
Why each happens — and the OSHA control that stops it
The useful way to study this is to pair each cause with its specific prevention control, because that is what employers must actually implement:
- Overturn → operator training + travel with load low and tilted back + slow cornering. OSHA requires the load center to stay within the stability triangle; overloading or lifting a load whose center of gravity is beyond the rated load center invites a forward tip.
- Struck-by → pedestrian separation, horns at intersections, marked walkways, and traveling in reverse when the load blocks forward view.
- Falling load → correct stacking, rated capacity limits, and inspecting pallets before lifting.
- Falls → no riders on forks; use an approved, secured work platform for elevating people.
- Dock incidents → wheel chocks, trailer restraints, and dock plates checked before entry.
Underpinning nearly all of these is training and evaluation: OSHA requires every operator to be trained, evaluated on the specific truck and workplace, and re-evaluated at least every three years.
The stability triangle
A sit-down counterbalanced forklift is supported at three points — the two front wheels and a single pivot at the center of the rear axle. Connect them and you get the stability triangle. As long as the combined center of gravity of truck-plus-load stays inside that triangle, the forklift is stable. Raising a load, adding weight beyond the rated capacity, or turning sharply shifts that center of gravity toward — and eventually across — an edge of the triangle, and the truck tips. This is why capacity is always stated at a specific load center (commonly 24 inches): a load whose weight sits farther out from the mast weighs 'more' to the tipping math even if the scale reads the same.
The bigger picture
Across the U.S., OSHA and NIOSH data attribute roughly 70–100 forklift-related deaths per year and tens of thousands of serious injuries, with overturns the leading killer. Almost every incident traces back to a controllable root cause — training gaps, overloading, speed, or missing separation between trucks and people — which is why forklift safety is treated as a management-system problem, not just an operator-skill problem.
Frequently asked
What is the number one cause of forklift accidents?
Tip-overs (overturns) are the leading cause of forklift fatalities. The truck rolls sideways or pitches forward when its combined center of gravity moves outside the stability triangle — typically from sharp turns, raised loads, overloading, or driving on slopes.
How many forklift deaths occur each year per OSHA?
OSHA and NIOSH data attribute roughly 70 to 100 forklift-related deaths in the U.S. each year, plus tens of thousands of serious injuries. Overturns account for the largest share of the fatalities.
How can forklift tip-overs be prevented?
Keep loads within rated capacity and load center, travel with the load low and tilted back, slow down and avoid sharp turns, never turn on ramps, and ensure operators are trained. If a tip-over starts, stay in the seat, hold on, and lean away from the fall.
What is the forklift stability triangle?
It is the triangular base formed by a counterbalanced forklift's two front wheels and the single center pivot of the rear axle. The truck stays upright only while the combined center of gravity of the truck and load remains inside this triangle.
What OSHA training is required to operate a forklift?
Under 29 CFR 1910.178, operators must receive formal instruction, hands-on training, and a workplace evaluation on the specific truck type before operating one. Operators must be re-evaluated at least every three years, and retrained after accidents, near-misses, or assignment to a new truck.