M61 hold-ups near Chorley after vehicle overturns
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Emergency services shut the slow lane between junction 6 for Horwich and junction 8 for Chorley.
The incident happened at around 3:45 this afternoon and police say it is causing some delays for drivers, with tailbacks as long as four miles on the approach to the scene.
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Hide AdNorth West Motorway Police and Highways England closed the entire carriageway for a short while and urged motorists caught up in the queues to be patient.
A spokesperson said: "There is very slow traffic due to a rolled over vehicle.
"Please be patient. We will reopen the carriageway when it is safe to do so."
A short time later lanes two and three were reopened, but residual delays are expected to last until between 6:15 and 6:30pm.