Archaeologists face a race against time after the discovery of what are believed to be the remains of a stone age settlement on the A30 in Cornwall.
The Highways Agency allowed the archaeologists access to the site ahead of the dualling next to Goss Moor.
Heavy machinery has already began stripping part of the route, leaving little time for the dig.
They are trying to record all signs of human activity and so far have come across a lot of evidence of mining.
Meanwhile, circular stone structures have been uncovered at Belowda, near Roche.
These ruins include old stream workings, some leats and culverts which may be tied in to more intensive tin workings, and the settlement.