The National Academies

NCHRP 20-50(8&13) [Completed]

LTPP Data Analysis: Factors Affecting Pavement Smoothness

  Project Data
Funds: $199,998
Research Agency: Soil & Materials Engineers, Inc.
Principal Investigator: Starr D. Kohn
Effective Date: 10/25/1999
Completion Date: 12/30/2001

The project identified tends for pavement smoothness for the different new and rehabilitated pavement types included in the Long Term Pavement performance (LTPP) studies.

Pavement smoothness has been recognized as one of the measures of pavement performance. However, the contributions of pavement structure and features, rehabilitation techniques, climatic conditions, traffic levels, layer materials and properties, pavement distress, and other factors to changes in pavement smoothness are not well documented. Therefore, there is a need to identify the factors that cause changes in pavement smoothness and to determine the extent of such short-term and long-term changes. This information will help in the selection of appropriate pavement structure, design features, and rehabilitation strategies that will ensure long-term smoothness

The research included a review of literature relevant to pavement smoothness, review and analysis of the data available from the LTPP studies, and performance of analytical investigations. LTPP data were analyzed to examine short-term and long-term pavement smoothness of each of the 11 experiments included in the LTPP studies. The analytical investigations identified the factors contributing to different levels of smoothness. The agency final report is available as
NCHRP Web Document 40 and is summarized in NCHRP Research Results Digest 264.

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