Initially police closed off only two lanes following a multi-vehicle accident, to which they were called at 12.35pm.
But a full closure in both directions has now taken effect with Highways England saying delays will add 60 minutes to usual journey times. A diversion is in place. Unofficial estimates are that the carriageway is unlikely to open fully until 3.30pm.
A police spokeswoman said three lorries and a car were involved in the crash and both an air ambulance and the fire service were in attendance.
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It is understood an initial examination indicated the man is not badly injured.