3/4 lanes are currently closed on the M1 in Milton Keynes.
UPDATE - The scene is now clear and all lanes have re-opened on the M1 northound between J13 and J14.
There are currently delays on the M1 Northound between J13 and J14 following a collision involving an overturned vehicle.
Emergency services are in attendance.
"Please allow extra time for your journey. Thank you for your patience," National Highways say.