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Data Collection


The Long-Term Pavement Performance (LTPP) program monitors more than 2,400 asphalt and portland cement concrete pavement (PCC) test sections throughout the United States 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: LTPP InfoPave made its debut at the 93rd TRB Annual Meeting in January. The system allows users to more easily tap into the wealth of pavement data available through FHWA’s Long-Term Pavement Performance (LTPP) program. LTPP InfoPave offers a gateway to data from the LTPP test sections, as well as findings from data analyses and extensive documentation for the many aspects of LTPP experiment design, data acquisition, quality control, and data dissemination. To start exploring LTPP InfoPave, visit www.infopave.com. Visitors will also find information on LTPP InfoPave Mobile, a companion application for smart phones. Contact: Aramis Lopez 202-493-3145, aramis.lopez@dot.gov

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



Office of Infrastructure R&D Links

» Office of Infrastructure R&D
» Infrastructure R&D Program
»Long-Term Bridge
  Performance Program

»Long-Term Pavement
  Performance Program
» Infrastructure R&D Experts
» Infrastructure R&D Laboratories
» Infrastructure R&D Projects
» Infrastructure R&D Publications
» Infrastructure R&D Topics


LTPP Email Distribution List

» Contact LTPP Customer Support Service Center at ltppinfo@dot.gov if you would like to be added to our email distribution list for LTPP Newsletters and other announcements.


FHWA Pavement Links

» Design
» Construction
» Preservation
» Maintenance
» Management
» Rehabilitation


More Information



» Aramis Lopez
E-mail Aramis
» Customer Service 202-493-3035
Federal Highway Administration | 1200 New Jersey Avenue, SE | Washington, DC 20590 | 202-366-4000