Region: North West
M6. Carlisle By-pass & Penrith to Carlisle (J41 to J44)
Statistics and options.
| Section | Construction started | Opened to traffic |
| Carlisle By-pass | December 1968 | December 1970 |
| A74 Reconstruction | September 1969 | December 1970 |
| Penrith to Carlisle | March 1969 | July 1971 |