Region: East/London/South east
The M25 - Statistics
| Section | Construction started | Opened to traffic |
| Dartford Tunnel Southern Approach | January 1985 | September 1986 |
| Dartford to Swanley (J1 to J3) | May 1974 | April 1977 |
| Swanley to Dunton Green | January 1984 | February 1986 |
| Dunton Green to Sundridge Road | September 1977 | July 1980 |
| Sundridge Road to Westerham | December 1976 | November 1979 |
| Westerham to Godstone (J6) | July 1976 | November 1979 |
| Godstone to Reigate (J6 to J8) | January 1972 | February 1976 |
| Reigate to Leatherhead | May 1983 | October 1985 |
| Leatherhead interchange | July 1982 | October 1985 |
| Leatherhead to Wisley | November 1982 | October 1985 |
| Wisley to Chertsey (J11) | September 1981 | December 1983 |
| Advance bridges | November 1978 | September 1980 |
| Chertsey to Thorpe (J11 to J12) | July 1978 | October 1980 |
| Chertsey link | April 1976 | December 1977 |
| Thorpe to Egham (J12 to J13) | July 1974 | December 1976 |
| Egham to Yeoveney (J13) | January 1979 | October 1981 |
| Yeoveney to Airport spur (J13 to J14) | September 1980 | August 1982 |
| Runnymede bridge | June 1977 | July 1980 |
| Airport spur to M4 (J14 to J15) | April 1983 | December 1985 |
| M4 to Iver Heath (J15 to J16) | April 1983 | September 1985 |
| M40 Interchange (J16) | July 1982 | September 1985 |
| M40 to Maple Cross (J16 to J17) | January 1983 | January 1985 |
| Maple Cross to Hunton Bridge (J17 to J19) | October 1973 | February 1976 |
| Micklefield to South Mimms (J19 to J23) | Various | October 1986 |
| South Mimms to Potters Bar (J23 to J24) | May 1973 | September 1975 |
| Potters Bar to Waltham Cross (J24 to J25) | June 1979 | June 1981 |
| Waltham Cross(J25) to River Lee | September 1980 | January 1984 |
| River Lee to Upshire(J26) | July 1981 | January 1984 |
| Upshire to Theydon Garnon (J26 to J27) | June 1981 | January 1984 |
| Theydon Garnon(J27) to Passingford Bridge | October 1980 | April 1983 |
| Passingford Bridge to Brentwood(J28) | January 1981 | April 1983 |
| Brentwood to North Ockendon (J28 to J29) | October 1980 | April 1983 |
| North Ockendon(J29) to Stifford Road | September 1979 | December 1982 |
| Stifford Road to Mar Dyke | January 1979 | December 1982 |
| Dartford Tunnel North Approach | March 1957 | November 1963 |
| Dartford Tunnel | June 1972 | May 1980 |