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From page 30...
... NCHRP Web-Only Document 142: Precision Estimates of AASHTO T 242 30 CHAPTER 3- CONCLUSIONS AND RECOMMENDATIONS 3.1 CONCLUSIONS This study was conducted to prepare precision estimates for AASHTO T 242, "Frictional Properties of Paved Surfaces Using a Full-Scale Tire." The data for this study were collected by Texas Transportation Institute (TTI) and Transportation Research Center (TRC)
From page 31...
... NCHRP Web-Only Document 142: Precision Estimates of AASHTO T 242 31 (2004) is smaller than the standard deviation proposed for hot mix asphalt surface (2.87 FN)
From page 32...
... NCHRP Web-Only Document 142: Precision Estimates of AASHTO T 242 32 3.3 PRECISION STATEMENT FOR AASHTO T 242 PRECISION STATEMENT FOR AASHTO T 242 "FRICTIONAL PROPERTIES OF PAVED SURFACES USING A FULL-SCALE TIRE" X Precision and Bias X.1 Precision X.1.1 Single Operator Precision - The single operator standard deviation (1s limits)

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