Broken-down vehicle at junction between M25 and A1 near South Mimms

The A1(M) has been shut on the northbound carriageway near Junction 4 for Hatfield. Picture: Archant

The A1(M) has been shut on the northbound carriageway near Junction 4 for Hatfield. Picture: Archant - Credit: Archant

A lane of the A1 is closed this morning due to a broken-down vehicle at the junction with the M25.

The event, which has taken place close to South Mimms, is expected to clear between 9.45am and 10am with traffic returning to normal at about the same time.