The Aust (J21) to Wickham (J14) section of M4 Statistics and options

Section Construction started Opened to traffic
Aust to Almondsbury (J21 to J20) August 1963 September 1966
Almondsbury Four Level Interchange (J20) May 1964 September 1966
Almonsbury to Tormarton (J20 to J18) April 1964 January 1966
Tormarton to Wootton Bassett (J18 to J16) July 1969 December 1971
Wootton Basset to Liddington (J16 to J15) July 1969 December 1971
Liddington To Wickham (J15 to J14) December 1969 December 1971