Which is the longest motorway in Britain?
M6 motorway M6 motorway The M6 motorway runs from junction 19 of the M1 at the Catthorpe Interchange, near Rugby, Coventry via Birmingham then heads north, passing Stoke-on-Trent, Liverpool, Manchester, Preston, Lancaster, Carlisle and terminating at the Gretna junction (J45). Here, just short of the Scottish border it becomes the A74(M) which continues to Glasgow as the M74. As of 2016, the M6, as well as combining with the length of the A14 from Brampton (Cambridgeshire) from junction with A1(M), the A74(M) and M74 to the junction with the M8 in Glasgow, forms the longest non-stop motorway in the United Kingdom and
M6 motorway 1970, the Lancaster–Penrith link was completed, along with a short section of motorway by-passing the south of Walsall. The most northerly section of the motorway also opened in 1970, running to the designated terminus north of Carlisle. By 1971, the full route was completed between the junction with the M1 motorway at Rugby and the A38 road several miles north-east of Birmingham city centre, including Bromford Viaduct between Castle Bromwich (J5) and Gravelly Hill (J6), which at 3½ miles is the longest viaduct in Great Britain. Junction 6 in Birmingham is widely known as Spaghetti Junction because of its complexity