Region: South East
M3. London to Southampton
Statistics and options.
| Section | Construction started | Opened to traffic |
| Sunbury to Lightwater (J1 to J3) | January 1971 | July 1974 |
| Thames Bridge | November 1968 | March 1971 |
| Lightwater to Hawley (J3 to J4) | October 1968 | June 1971 |
| Hawley to Basingstoke (J4 to J6) | December 1968 | June 1971 |
| Winchfield railway bridge | October 1968 | October 1970 |
| Basingstoke to Popham (J6 to J8) | December 1968 | June 1971 |
| Popham to Bar End | ? | May & August 1985 |
| Bar End to Compton (J10 to J11) | ? | 1995 |
| Compton to Pitmore (upgrade of A33) (J11 to J12) | ? | 1995 |
| Pitmore to Chilworth (J11 to M27(J4)) | ? | February 1992 |