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Construction Timeline
When the various parts of the M20 were built, listed in chronological order.
| Open | Jct | Section | |
|---|---|---|---|
| Dec | 1960 | J5-7 | Maidstone Bypass West (opened as A20(M)) |
| Sep | 1961 | J7-8 | Maidstone Bypass East (opened as A20(M)) |
| Dec | 1971 | J3-5 | Ditton Bypass |
| May | 1977 | J1-2 | Swanley → West Kingsdown |
| 1981 | J2-3 | West Kingsdown → Wrotham | |
| Oct | 1981 | J11-13 | Sellindge → Folkestone |
| Dec | 1981 | J9-11 | Ashford → Sellindge |
| May | 1991 | J8-9 | Maidstone → Ashford |
