The A684 has primary status for the short length between Kendal and junction 37 of the M6 motorway, though even this primary section involves two hills and some tricky twists. East of the M6, the road descends the "Black Horse" hill and passes through Sedbergh where there is a short diversion to avoid the main street and a difficult right-angled bend. Another right-angled bend east at Garsdale Hall, and the road goes further up the valley to the watershed at Garsdale Head. After this the road passes under Garsdale (or Dandry Mire, or Moorcock) viaduct where after there is a junction with the B6259 road to Kirkby Stephen. The road drops down through upper Wensleydale into Appersett, a junction with the B6255 and into the town of Hawes