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