The A1(M) is closed northbound after a multi-vehicle crash. (Image: Archant)
There are delays on the A1 at Potters Bar and Hatfield due to congestion.
The Potters Bar delays are on the southbound side, between junctions two and one.
The Hatfield delays are at the northbound exit at junction four.
The delays are expected to end by 6.30pm.
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