UPDATE: All lanes now reopen. Six miles of congestion is beginning to clear, but delays could still be up to 45 minutes.
One lane of the M1 southbound between junction 15 for Northampton and junction 14 for Milton Keynes is closed.
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According to National Highways, there is approximately 5.5 miles of congestion, which equates to around 45 minutes of delays.
Recovery is on the way for all vehicles involved.
Drivers are urged to avoid the area if possible, or prepare for delays.