Queensland Licence to Operate a Forklift Truck (TLILIC0003) Practice Exam

Turning on a slope changes how gravity and turning forces interact with the forklift’s base of support. On an incline, the weight vector shifts relative to the wheel contact points, so the downward force isn’t aligned with the center of the base. When you start to turn, inertia (the centrifugal effect) pushes the load outward. On a slope, this outward push adds to the downhill component of gravity, making the combined force more likely to move outside the wheelbase. If the resultant force lies outside the support polygon, the forklift can tip sideways.

On a flat surface, gravity acts straight down through the base and the tipping tendency from turning is reduced, so the sideways tipping risk is lower. Stopping to reassess load height or turning with a high load are important safety considerations, but the scenario that most directly contributes to tipping sideways during a turn on a slope is turning while on the slope itself.