Traffic is easing on the A1 following a "medical emergency".
The A1M northbound between J3 A414 and A1001 in St Albans and J4 A414, A1001 and A6129 at the Hertford turn off were affected earlier this evening.
There was also congestion on the A1M to J1 M25, A1 and A1081 St Albans Road and Bignells Corner.
Highways England have confirmed the A1M has now reopened completely in both directions.
It is not yet known what has happened but an air ambulance was reportedly at the scene.
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