A large part of the basis of the road network in Britain is many hundreds of years old, over time the roads have been upgraded to what we have today. Most roads have appeared out of necessity, it is only i relatively modern times that there has been concern for archaeological sites. Sites like Stonehenge and the earthworks at Durrington Walls are examples of archaeological sites that are visible and recogisable in the landscape. The truth is beyond what is visible - lying beneath the ground, Britain is one huge archaeological site there are very few areas untouched by man in the last 10,000 years (and beyond).
Something is not right. This message is just to keep things from messing up down the road