Highways England is warning of delays after a crash near Potters Bar involving a lorry and two other vehicles.
Highways England has tweeted a message to all road users, warning of the crash and building traffic.
Three of four lanes are closed on the clockwise carriageway between Junction 23 at South Mimms for the A1(M) and Junction 24 for Potters Bar.
The crash has happened near Potters Bar.
Highways England states: “Delays building. Our Traffic Officers are en route.”
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