blocked lane

Hope someone can help. Riding in wales on sunday. Set of from llanarmon, over river Ceiriog, up the hill & over to Nantyr. Came to a gate with a rock which was the full width of the lane & behind that a huge block of concrete. Further along at another gate, another full width rock. Next in one of the narrowest parts of the lane a huge tree root. At the last gate where you come to the tarmac, another full width rock. Getting past the rocks wasn't too much trouble, the tree root was a tight squeeze. No chance in a 4x4. No signs for a tro but dodgey laminated photocopy police notices. Hope someone can shed light or knows who to contact. Thanks Tony.