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Report
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Publication Number: FHWA-HRT-08-065
Date: November 2008

Long-Term Pavement Performance Compliance With Department of Transportation Information Dissemination Quality Guidelines

CHAPTER 2. COLLECTION OF DATA

The DOT IDQG regarding the collection of data are generic to encompass a wide range of data collection methods. LTPP data collection methodology is best characterized as a mix of one-time surveys, periodic collection of condition data, continuous reporting of climate and traffic loading, and compilation of data collected by others.

The LTPP data collection operations comply and, in some cases, surpass the DOT's IDQG. The LTPP data collection operations include an array of techniques including data collection forms, electronic measurement systems, automated data acquisition, and use of data collected by third parties. The one data collection approach not used by LTPP is a statistical response survey. Some of the LTPP activities noted under data collection operations should be considered for addition to the DOT guidelines.

Data Collection Operations

With the vast array of data collection methods employed by the LTPP program, the following operational procedures had to be developed:

Missing Data Avoidance

Missing data avoidance is a significant issue for a program like LTPP that relies on voluntary participation by highway agencies for supply of important data elements. The program also relies on notification from highway agencies prior to the application of maintenance and rehabilitation treatments so that pavement condition measurements can be made. Some of the steps employed by the LTPP program to reduce missing data include the following:

 

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