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A man was arrested after overturning his car on the M20 between Junction 8 (Maidstone services) and Junction 9 (Ashford).
Emergency services attended the scene on the coastbound carriageway at around 10pm last night.
Witnesses said that they saw a "horrible" accident while they were on the motorway.
Police officers arrested a 27-year-old man on suspicion of drink-driving.
The man, from Ashford, has since been released pending further enquiries.
No serious injuries have been reported.