There are severe delays on the M1 following a crash between Junction 8 for Hemel Hempstead and Junction 9 for Redbourn.
Police closed both carriageways to allow for the safe landing of an air ambulance following the crash – which involved a van.
The southbound carriageway has since reopened, and police are clearing the scene to ensure the road is safe to use.
However, traffic is delayed between Junction 5 and Junction 9, as well as on the M25/M1 interchanges, following a further collision.
Bedfordshire, Cambridgeshire and Hertfordshire Road Policing Unit tweeted: “Drive to the prevailing weather and traffic conditions. These collisions were avoidable.”
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