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Abstract:Many in the asphalt industry believe that initial pavement smoothness directly relates to
pavement life. Public perception of smoothness is also important. Oregon is interested in
determining the appropriate method of measurement to quantify smoothness in terms of
performance and public perception. Several smoothness indices exist, however, they need to be
compared and evaluated for application in Oregon.
A literature search was undertaken to identify publications having information on indices and
equipment used to measure the pavement smoothness. The majority of sources identified were
contained in the National Cooperative Highway Research Program Project 1-31, Smoothness
Specifications for Pavements, published in March 1997. Project 1-31, therefore, became the
primary source of report information.
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