The B5057 is a largely rural B-road in central Derbyshire.
It starts on the B5056 to the west of the village of Winster and heads east along Main Street through the village centre, passing the Market House, now owned by the National Trust. After leaving town the road descends into Wensleydale and follows the valley to Wensley itself before descending steeply into the Derwent Valley and the village of Darley Bridge. The river is crossed by the eponymous bridge, which is old and narrow, before the road enters Darley Dale. It crosses the preserved Peak Rail line at a level crossing by Darley Dale station before continuing on to reach the A6.
The B5057 crosses the A6 at a staggered crossroads before climbing steeply up Sydnope Hill (which according to signs is a dangerous hill and therefore closed to HGVs) out of the valley. At the top of the hill it goes through a wood before reaching a crossroads and entering open country. It continues dead-straight across the moors before bending sharply to the right on reaching a crossroads. The road then continues more-or-less straight to end at a T-junction on the A632 on Stone Edge; this junction is right on the edge of the plateau. Chesterfield is a few miles to the left.