Closures on the A1(M) near Stevenage have now been lifted, after an overhead cable had fallen on to the carriageway.
Police closed the road between Junctions 7 and 8 in both directions while the cables were located and assessed by the fire service and power company specialists.
The area was deemed safe and closures were lifted by 4.15pm.
There continues to be delays of up to 22 minutes in the northbound carriageway.
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