A sunken lane is a road or track that is significantly lower than the land on either side, not formed by the engineering of a road cutting but possibly of much greater age.
Holloways may have been formed in various ways, including erosion by water or traffic; the digging of embankments to assist with the herding of livestock; and the digging of double banks to mark the boundaries of estates.
Wikipedia https://en.wikipedia.org/wiki/Sunken_lane
Address 79359, Germany
Coordinates 48°8'50.072" N 7°44'58.822" E