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The principal mechanical parameters of soils are moisture content, load-bearing capacity, shear strength and soil settlement, which in turn influences soil density. These characteristics take effect on the vehicle's motion through the shear and normal loads which develop between the soil and the tyre. Moisture content assists the travel of the vehicle in some soils assists and hinders it in others. The level of settlement of the soil crucially influences its load-bearing capacity. Newly-tilled soil has a poor load-bearing capacity, and is therefore prone to large vertical deformations. Measurements were performed on a particular loam soil to determine the changes of internal friction with moisture content, cohesion and cone index with settlement.