Overview
- The incident occurred shortly before 09:00 near Junction 19 for Tabley and Knutsford, according to National Highways.
- Northbound is shut between J19 and J20 at the Lymm Interchange, with southbound traffic diverted via the J19 slip roads.
- Cheshire Police, North West Ambulance Service and National Highways officers are on scene, with the air ambulance landing in a nearby field.
- National Highways says the closure will be protracted while collision investigators work, with the shutdown expected to last several hours.
- Delays already exceed 45 minutes and drivers are advised to follow the signed diversion via the A556 and M56 or consider alternative routes.