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.

As you can see devastating :D

Hi Fancy, we would use some wooden boards under the jacks to increase their surface area

We do yes, 600kg of steel blocks

I suggest you'd need something weight at least 14 tons

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.

Well spotted, the video was cut from a couple of CBR tests

CBR (%)= 6.1 × 10^-8 × (k762)^1.733 where k762 is the Modulus of Subgrade Reaction, defined as the applied pressure under the loading platen divided by the displacement (normally 1.25mm) with a plate of 762mm (30 inch) diameter. The Modulus of Subgrade Reaction for other plate sizes can be determined using an appropriate conversion factor

Suppose you use a 400mm plate, the measured k is 40, the conversion factor is about 0.6. Does that mean the K762 is 40*0.6=24.

Nice

there are many-weighing balance to measure the weight of the vehicle and its material together....but out point it to check the load from the loading gauge which is shown in the video and monitor at 5, 10,15, so on up to 100kN.