 NY 166 is a two-lane highway its entire length.NY 166 begins at an intersection with NY 28 (South/North Main Street) in the village of Milford as an eastward continuation of County Route 44 (CR 44; West Main Street).NY 166 progresses eastward as East Main Street to the north of Wilbur Park along a residential neighborhood before crossing railroad tracks and intersects with River Street, where it turns northeast out of the village.