Essential maintenance will take place overnight on the A702 Sprocket Cottage, north of Coulter between 8pm and 6am on Thursday 11th July 2019.
The scheme requires an overnight closure of the A702, north of Coulter, with a signed diversion route in operation from Melbourne Crossroads to Maidencotts Roundabout.
The A702 between Biggar and Edinburgh will be unaffected.
Bus routes to Biggar will be unaffected, and the Stagecoach service from 101 from Edinburgh to Dumfries will be escorted through the works.
Traffic heading south of Biggar will exit the A702 at Melbourne Crossroads and join the A721 through Carnwath and Carstairs to Hyndford Bridge. From here traffic will follow the A73 to re-join the A702 at Maidencotts Roundabout.
Northbound traffic will follow the same diversion in the opposite direction.