ASPHALT AND GRANULAR THICKNESS Case Study Asphalt thickness and fill depths can be determined with ground-cou - pled GPR at highway speeds without the need for closing lanes. The SmartTrailer results show how easy it is to pinpoint anomalously thin and thick sections and changes in construction practice. Roadmap survey continued on page 2 Pavement structure data on the CPATT (Centre for Pavement and Transportation Technologies) test road at

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