Entering Kent, it runs past Swanley and the racing circuit at Brands Hatch before descending steeply from the North Downs escarpment past Wrotham and on to the county town of Maidstone.
Entering Kent, it runs past Swanley and flows directly onto the M20 motorway. The A20 then passes the racing circuit at Brands Hatch before descending steeply from the North Downs escarpment past Wrotham and on to the county town of Maidstone.