The A46 southbound between North Hykeham and Winthorpe will be closed tonight as emergency patching working is carried out.
The Highways Agency has announced the closure between 8pm and 5am. The road will be closed between the North Hykeham roundabout and the Winthorpe services roundabout.
The road will be closed again tomorrow, between the same times, northbound to carry out the works on the opposite side of the road.
Diversions will be in place.