Drivers are being warned to expect severe unavoidable congestion while Electricity North West carries out emergency work in Westhoughton.
Temporary traffic lights will be in force 24-hours a day at the bridge at Hall Lee Bank Park, Park Road, close to its junction with Cricketers Way, to allow repairs to an underground cable.
The lights will be manned during rush hour (7am to 9.30am and 5.50pm to 7pm) to improve traffic flow.
The work started at 9.30am today and could to last until Wednesday (March 21). Drivers are advised to use alternative routes where possible.