only about 1 km long, jctn 24 m62 head a629 toward huddersfield turn left Yew Tree Rd at Tjunction head straight across on to byway, this part usually dosnt show up on internet maps best to use OS maps, on memory map mine is region 8 think its landranger 110 but mot sure. this lane is not for the faint hearted i had to get pulled out by my dads tractor, the council are supposed to be resurfacing but i dont know if theyve done it, i would advise you drive half way down to the bridge in the trees where you can turn round if you change your mind, then walk the rest of the way to check, heavy rain may have made it even worse, i didnt walk the route first cause i'm an arse. the wife thought it hilariouse for about 20 seconds and the pajero couldnt even get down the lane far enough to pull me out