The A11 southbound near Snetterton is now clear following a crash involving a lorry and a car.
Police were called at 9.19am to the collision between a Honda Civic and a lorry about three quarters of a mile past the Snetterton junction.
It is believed there are no injuries.
Police said the road was blocked and debris was across the carriageways.
The road was clear at just after 10.30am.
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