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From page 1...
... NCHRP Web-Only Document 142: Precision Estimates of AASHTO T 242 1 CHAPTER 1- INTRODUCTION AND RESEARCH APPROACH 1.1 INTRODUCTION Under National Cooperative Highway Research Programs (NCHRP) Project 9-26, the AASHTO Materials Reference Laboratory (AMRL)
From page 2...
... NCHRP Web-Only Document 142: Precision Estimates of AASHTO T 242 2 1.3 RESEARCH OBJECTIVE The objective of Task 7 of NCHRP 9-26A study is to prepare single-operator and multilaboratory precision estimates for the AASHTO T 242, "Frictional Properties of Paved Surfaces Using a Full-Scale Tire" using data collected based on the most recent version of the test method. The resulting precision estimates would reflect a variety of paved surfaces and vehicle speeds included in the evaluation of the state friction systems.
From page 3...
... NCHRP Web-Only Document 142: Precision Estimates of AASHTO T 242 3 Table 1-1- Number of friction systems operated at different speeds on various surfaces of the TTI test field 1.5.2 TRC Friction Data The TRC data used in the study are referred as the Arrival (ARR) and Departure (DEP)

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