A sunken road at Waterloo (no, not that one!)
Now on Youtube for those outside UK, Alice Roberts looks at some of the excavations around Hougemont farm by Waterloo Uncovered. These include a sunken road used to move ammunition to the defenders. https://www.youtube.com/watch?v=R3g-fveU14M (3m-13m)
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It makes sense that if the road surface was deeper, and the trees/hedges either side did arch over, it very much was the ‘covered way’?
Perhaps this may have led to the confidence in leaving the Northern gates open?