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