The A1(M) northbound was closed for three hours following the collision. Picture: Archant (Image: Archant)
Northbound traffic is being held on the A1(M) this evening following a serious crash between J6 for Welwyn and J7 for Stevenage.
Highways England tweeted that there are delayed of nearly an hour, with approximately 10 miles of slow traffic on the approach to J6.
All lanes remain closed at this time.
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