Region: South East
M20. London to Folkestone and A20 to Dover
Statistics and options.
| Section | Construction started | Opened to traffic |
| Swanley to West Kingsdown | March 1975 | May 1977 |
| West Kingsdown to Wrotham | July 1976 | February 1980 |
| Ditton By-pass | December 1969 | December 1971 |
| Maidstone By-pass west (J4 to J6) | March 1959 | December 1960 |
| Maidstone By-pass east (J6 to J7) | April 1958 | September 1961 |
| Maidstone to Ashford | January 1989 | May 1991 |
| Ashford to Sellindge | September 1978 | December 1981 |
| Sellindge to Folkestone | September 1978 | October 1981 |