Background

A primary objective of the Long Term Pavement Performance (LTPP) program was to develop improved design methodologies and strategies for the new flexible pavements. Those experiments designed to address this objective include
General Pavement Study (GPS) 1 and 2. The GPS 1 experiment includes existing flexible pavements without stabilized base layers, while the GPS-2 experiment includes those with stabilized base layers. The Special Pavement Study (SPS) 9 experiment and control sections within the SPS-5 experiment can also be used to achieve this objective.


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