Lyman
Thanks, I've got it. It is fact the same picture as Fig 74 in the BEA report, which I missed..
It looks to me that Fig 24 of the BEA report was taken from just about where the two men are standing together in the picture you are using, but being much closer to the action it shows much more clearly the tyre imprints and tracks.
I recommend looking carefully at that Fig 24 because although you can see the obvious cyclic imprint of the flapping remnants of the tyre if you run a ruler over the line of imprints there is no evidence of lateral oscillations whatsoever that I can see.