A four-way traffic control is in place at the junction of Preston Old Road and Buncer Lane.
Work is being carried out by Electricity North West further up Spring Lane but traffic lights are in place on Redlam and Preston Old Road. The lights are causing major delays for drivers heading into Blackburn along Preston Old Road. There are also delays for motorists heading down Buncer Lane.
Few alternative routes are available for anyone heading to Cherry Tree and Pleasington.
The work is expected to be completed by the evening of Friday 23 July.