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One lane of the motorway was closed after a crash involving two cars and a lorry.
Traffic queued for one mile along the coastbound carriageway of the M20 between Junction 3 and Junction 4 for Snodland.
Lane one of four was closed as a result of the collision.
National Highways expected the incident to be cleared by about 7.15pm, with normal traffic conditions returning just before 8pm.
An M20 coastbound lane at Junction 4 for Snodland was also closed on the entry slip road due to a broken down lorry.
A police spokesman confirmed officers were called to the scene at 4.42pm and no injuries were reported.
The ambulance service has been approached for more information.