The incident took place at 10pm on Tuesday 8 February 2022 and involved a silver BMW M6 that left the coastbound carriageway at junction 3.
The driver, a man in his 20s, sustained serious injuries and was taken to a London hospital where he remains in a serious condition.
Officers from the Serious Collision Investigation Unit (SCIU) would like to speak to anyone who witnessed the incident, or who has dashcam footage that may assist the investigation.
Witnesses should call the SCIU appeal line on 01622 798 538 or email[email protected]quoting reference SM/DS/26/22.
