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We can see that as the number of pounds of weight the tire supportsincreases, the units of traction do not increase at the same rate. Thedashed line would represent a linear equal increase in traction to theincrease in weight supported by the tire. In reality, the solid linemore closely represents the true picture. At 300 pounds of load, theunits of traction are 2.4. If we double the load to 600 pounds, theunits of traction only increase to 4.4, instead of double, which wouldbe 4.8.