It is difficult to accurately predict of course, but surely a vital thing to work out is whether, if the view to the stones was lost, would traffic be reduced?
As in, if the tunnel was built would there still be the same volume of traffic on that road?
If so, then that does support the case for a *long* tunnel.
Or is it the case that the 303 is only so busy because people divert to it so they can see the stones?
Imagine the building of a tunnel at great expense financially and archaeologically, only to find the traffic using it is 50% of what it was.
If this were the case (I suppose you could get close to a decent answer with survey) then perhaps a one way or toll system would work out to be the better option?
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