LTPP still has approximately 750 sections in use in 49 states. As these sections reach their useful life, knowing why they ultimately failed must be determined by forensic review. A letter, from Professor Carl L. Monismith, Director of the Pavement Research Center at the University of California, Berkeley, eloquently states the need and the reason for these forensic studies of LTPP sections. (Attached).

Create a pooled fund to rapidly complete forensic evaluations of LTPP sections before going out of service. Approximately 750 sections remain in service.

Investigating LTPP test sections as they prepare to go out of service, capturing data on exactly why the section failed and had to be removed from service. This may entail trenching and coring, measuring lift deflection, and potential lab testing of field samples for materials characteristics. The pooled fund will pay the costs to perform the forensic evaluation in the field and limited lab testing from field samples. Additional work will include building tracking lists of remaining sites, contacting states for updates on site status and planning action for sites about to go out of service. Summary of Requirements for Project Sponsors •Financial support. •Meeting participation on conference/web calls and in face-to-face meetings if deemed necessary. •Active collaboration/partnering with all TAC members. •Championing, within their state/organizations, the deliverables from the pooled fund.

ESTIMATED PROJECT DURATION The pooled fund project duration is for five years, with a future option to extend if sections remain in service, and pending funding availability. BUDGET AND SPONSORSHIP Aiming for at least 10-15 states minimum and $20,000 per year for a minimum of 3 years. It is anticipated that FHWA, other agencies, and industry may also participate in the pooled fund.