The A1(M) has been closed between Welwyn Garden City and Stevenage while emergency services deal with a serious collision.
The crash took place at around midday today (Saturday, January 11), at Junction 6 for Welwyn and Welwyn Garden City.
An air ambulance was called to the scene, as well as Herts police and traffic officers.
The northbound carriageway is closed between Junction 6 for Welwyn and Junction 7 for Stevenage, and traffic was stopped on the southbound carriageway to allow the Essex & Herts Air Ambulance to land. Screens were used to protect members of the public from seeing the scene.
Southbound traffic was released at around 1.45pm, and a diversion route remains in place around the northbound closure.
Drivers are advised to allow extra time for their journey and use alternative routes if possible.
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