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It is my understanding that ground-breaking (in the literal sense) construction work is usually preceded by an archaeological survey and access is allowed for archaeologists to examine anything of interest before the ground is disturbed. Anything of interest that turns up during construction is similarly offered for archaeological examination and in this way roadworks or house-building actually encourage archaeology. This is certainly the normal practice in the northeast of Scotland (in fact it is mandatory, at least in some circumstances) so why do you say "All archaeology in the construction zones would be destroyed"?
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