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... 1 Geophysical methods provide an effective and economical means to characterize subsurface conditions for transportation projects. Despite these benefits, challenges and obstacles remain that must be overcome if routine implementation of geophysical methods for transportation projects is to be realized.
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... 2 Advancements in Use of Geophysical Methods for Transportation Projects agency uses geophysical methods more than 10 times per year. For half of the agencies with geophysical experience, respondents indicated the frequency of use of geophysical methods is increasing.

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