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If traction increased at the same rate as loading, we would see a result indicated by the dashed line. It doesn't, so we see, as shown by the solid line, that as the number of pounds of loading on the tire increases, the units of traction do not increase at the same rate. At 300 pounds of load, the units of traction are 2.4. If we double the load to 600 pounds, the units of traction only increase to 4.4 instead of double which would be 4.8.