Two lanes are currently closed on the M1 Northbound close to Milton Keyes.
Severe delays and queues have built on the M1 between J12 A5120 Harlington Road (Flitwick) and J13 A421 Bedford Road (Bedford / Milton Keynes South).
Travel time through the area is currently estimated at around one hour 35 minutes.
Traffic had already built following a crash between J14 and J15 earlier in the day.
There have since been two further crashes that have forced the two lanes to be closed.
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