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Drivers were held on the M20 due to an accident involving two lorries.
The three-vehicle crash happened at J4 A228 Castle Way, for Leybourne and Snodland at around 9am.
The motorway was closed on the eastbound carriageway between J4 and J5 as a result.
All lanes reopened just after 10am but there are still some delays in the area.
An ambulance spokesman said: "Crews were called following reports of an RTC on the M20 at the junction 4 slip road.
"One male patient was assessed and treated before being taken to Medway Maritime Hospital for further checks."
Police have confirmed they also attended the scene.