The Long-Term Pavement Performance
(LTPP) program is a 20-year
study of inservice pavements across
North America. Its goal is to extend
the life of highway pavements
through various designs of new and
rehabilitated pavement structures,
using different materials and under
different loads, environments,
subgrade soil, and maintenance practices.
LTPP was established under the
Strategic Highway Research Program,
and is now managed by the Federal
Highway Administration