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51 REFERENCES 1. Strategic Highway Research Program, âSpecific Pavement Stud- ies, Experimental Design and Research Plan for Experiment SPS-1, Strategic Study of Structural Factors for Flexible Pave- ments,â National Research Council, February 1990. 2. Moulton, L. K., Highway Subdrainage Design, Federal High- way Administration Report No. FHWA-TS-80-224, 1980. 3. Von Quintus, H. L. and Simpson, A. L., âInitial Evaluation of the SPS-1 Experiment,â LTPP Data Analysis Technical Support Contract, No. DTFH61-96-C-00003, March 2000. 4. Killingsworth, B. and Jordahl, P., âEvaluation of IRI Decreases with Time in the LTPP Southern Region,â Draft Report, Federal Highway Administration Contract No. DTFH61-95-C-00029, September 1996. 5. Strategic Highway Research Program, âSpecific Pavement Stud- ies, Experimental Design and Research Plan for Experiment SPS-2, Strategic Study of Structural Factors for Rigid Pave- ments,â National Research Council, April 1990.