WWW.IRDINC.COM | info@irdinc.com INTERNATIONAL ROAD DYNAMICS INC. The primary goal of the North American Long-Term Pavement Performance (LTPP) program is to understand how and why pavements perform as they do in order to provide data and products that extend pavement life at a reasonable cost. Given the strong national interest in analyzing the pavement performance data collected at the Specific Pavement Study (SPS) sites, Federal Highway Administration (FHWA) established a national pooled fund study to increase the quantity and improve the quality of traffic data needed to support analysis projects. The FHWA Office of Infrastructure Research and Development administers the Nation’s LTPP program in cooperation with the American Association of State Highway and Transportation Off

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