Data Collection

The LTPP program monitors more than 2,400 asphalt and portland cement concrete pavement (PCC) test sections throughout the U.S. and Canada. A total of 792 of the LTPP test sections contain the common types of pavement in use in the U.S. (general pavement studies [GPS]), and 1,250 other test sections have been specially constructed to study certain engineering factors in pavement design (specific pavement studies [SPS]). At each GPS and SPS site, data on distress, roughness, structural capacity, traffic, and other variables are systematically collected. In addition, work groups of highway engineers periodically visit the sites to get a firsthand look at the pavements and to record their subjective observations.

Selected sites within the GPS and SPS experiments were continuously monitored for temperature and moisture as part of the Seasonal Monitoring Program (SMP) study. For the Dynamic Load Response study, Various PCC sections within the SPS-2 project were chosen for a study on pavement response under controlled loading conditions.

Additional information includes:

• GPS Experiments: Descriptions of the GPS experiments.

• SPS Experiments: Descriptions of the SPS experiments.

• Additional Studies: Descriptions of the SMP and the Dynamic Load Response studies.

• Data Collection: Monitoring schedules and contact information for each of LTPP's four regional offices.

• How to Get LTPP Data: Information on DataPave Online and requesting data from LTPP's database.

• Materials Reference Library: Information regarding LTPP's materials storage facility.