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We can see that as the number of pounds of load the tire supports increases, the units of traction do not increase at the same rate. The dashed line would represent a linear equal increase in traction to the increase in load supported by the tire. In reality, the solid line more closely represents the true picture. At 100 pounds of load, the units of traction are 1.0. If we increase the load to 600 pounds, the units of traction only increase to 4.4 instead of six times the load, which would be 6.0.