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A lorry closed part of the coastbound carriageway of the M20.
The vehicle has crashed into the central reservation on between junction six for Aylesford and junction five for Maidstone town centre.
Kent Highways and emergency services were called to the stretch of motorway just after noon.
Motorists were warned to expect delays and were being diverted off the motorway at junction six.
All lanes reopened at about 3.30pm.