1966
| Route | Open | Junctions | Section | ||
|---|---|---|---|---|---|
| 1 | M4 | Jan 1966 | J18-20 | Tormarton → Almondsbury | |
| 2 | M6 | Mar 1966 | J11-13 | Shareshill → Dunston | |
| 3 | M1 | May 1966 | J24-25 | Kegworth → Sandiacre | |
| 4 | M4 | Jul 1966 | J39-41* | Port Talbot Bypass | Opened as A48(M) |
| 5 | M32 | Sep 1966 | J0-1 | Hambrook Spur | |
| 6 | M4 | Sep 1966 | J20-21 | Almondsbury → Aust | |
| 7 | M48 | Sep 1966 | Severn and Wye Bridges | Opened as M4; became M48 in 1996 | |
| 8 | M6 | Sep 1966 | J10-11 | Darlaston → Shareshill | |
| 9 | M1 | Nov 1966 | J4-5 | Brockley → Berrygrove | |
| 10 | M1 | Nov 1966 | J25-26 | Sandiacre → Nuthall | |
| 11 | M74 and A74(M) | Dec 1966 | J5-8 | Bothwell → Hamilton |
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