Do not operate forklifts on soft ground, because the forklift is easy to sink in and difficult to get out on such ground. Do not let the diesel forklift get too close to the edge of the cliff, or the suspended part and deep trench. The vibration of the machine causes these places to collapse, and the forklift may fall or tip over, causing serious injury or death. Remember that the soil in these places will become soft after heavy rain, blasting or earthquakes. The soil piled on the ground and the soil near the ditches are soft, and may collapse under the weight of the 3 ton forklift or the vibration of the forklifts, causing the forklift to tip over.