Statistics of Double Lane Change Handling Tests Conducted on Tires Differing in Tread Compound Physical Properties

Variability in the double lane change test, a common subjective handling test, is defined based on the specific test used by BFGoodrich in 1982. Eight test protocol elements apparently required to ensure one half rating paint discrimination at 90 percent or greater confidence are reported. Further study of four points is recommended prior to routine use of the protocol elements. All results derive from statistically designed blind tests of 12 specifications differing widely in tread compound properties. Ratings varied from four to seven.