Region: South East
M4. Maidenhead to Wickham (J8 to J14)
Statistics and options.
| Section | Construction started | Opened to traffic |
| M25 to Langley (J5) | March 1963 | March 1965 |
| Slough By-pass (J5 to J7) | April 1961 | March 1963 |
| Slough & Maidenhead By-pass widening (J5 to J9) | October 1969 | October 1971 |
| Maidenhead By-pass (J7 to J9) | April 1959 | May 1961 |
| Holyport to Winnersh (J9 to J10) | December 1969 | December 1971 |
| Reading - Wokingham link interchange A329(M) | September 1971 | February 1973 |
| Winnersh to Theale (J10 to J12) | January 1970 | December 1971 |
| Theale to Wickham (J10 to J14) | December 1969 | December 1971 |