The driver was airlifted to King’s College Hospital in London with serious injuries after a crash incident on the A227 overbridge near Wrotham just before 11.20am today (August 18).
He remains there in a critical but stable condition.
His next of kin are aware.
Initial enquiries have established the incident as a single vehicle crash.
A tractor travelling on the A227 Gravesend Road became separated from its trailer and subsequently fell onto the central reservation between junction two and three of the M20.
Both the M20 and the A227 remain closed and a diversion is in place while the roads are made safe and both the trailer and the vehicle are recovered.
Motorists are advised to use alternative routes where possible.
A spokesperson for Kent Police said: “Anyone with information is urged to call the west Kent appeals line on 01622 604100, quoting reference 18-0475.
“Drivers with dashcam, who may have been in the area at the time of the incident, are also asked to check for footage.”
