Overview

• A police-led operation at Chiswell interchange on the M1 prompted northbound closures between junctions 6 and 6A and stopped traffic on adjacent M25 sections early on Friday.
• Emergency crews rescued an unidentified woman from beneath the carriageway, enabling both motorways to reopen shortly after 06:30 BST.
• National Highways warned that drivers continue to face delays of around 30 minutes despite the carriageways being back in operation.
• Motorists traveling northbound on the M1 are advised to follow the hollow diamond diversion route via the A405 and A414 before rejoining at junction 8.
• Hertfordshire Police have not confirmed when all restrictions will be fully lifted and recommend road users plan alternative routes through the area.