Region: North West
The Warrington-Preston section of M6 (J20 to J29)
Statistics and options.
| Section | Construction started | Opened to traffic |
| Thelwall advanced contract | September 1959 | July 1963 |
| Main contract | February 1961 | July 1963 |
| Thelwall new viaduct | May 1995 | |
| Refurbished Thelwall viaduct | December 1996 |