![]() ![]() 2 The fifth volume, Lessons Learned and Recommendations for Future Analyses, 3 was notable in its identification of problems and deficiencies of the LTPP database and changes that would improve its utility for future researchers. The results were published in five volumes. The studies, conducted in 19, utilized GPS data collected during the first 5 years of the program, since collection of SPS data was just getting underway.
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