The In-Situ CBR test carried out in the UK. This test is used to measure sub grade or formation strength for road design and construction. This is the definitive method of measuring CBR values on-site. Performed by Hixtra Ltd.
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Insitu and Lab CBRs will likely be quite different because of the constraining effect of the lab CBR mould, compactive effort and such like for coarser grained materials. Undisturbed fine grained samples for Lab CBR should yield similar results to Insitu CBR tests.
There are no direct impacts at all. It's non-invasive testing as the video quite clearly shows. However, indirectly, the use of a vehicle to get to the site will of course emit emissions, similar to all other site activities. But this is 'scraping the barrel' to appease your question.
