Each of the ten Provincial Highway Agencies participates in the C-LTPP project through the contribution and monitoring of in-service pavement test sites.  Information on the original pavement structure was gathered prior to placement of the overlays in 1989 or 1990.  Since then, the performance of each AC overlay has been monitored on an annual basis, and is expected to continue until the end of the overlay service life of the year 2004, whichever is first.

All pavement monitoring activities in C-LTPP are conducted according to two documents:

• C-SHRP Pavement Research Technical Guidelines - which provides detailed procedures and protocols for each data collection activity as well as the data collection forms, and;
• Summary of C-LTPP Monitoring Activities - which provides a convenient overview of the annual data collection requirements.

The types of data collected, responsibility for each and the fequency of testing is presented below.