| abstract | - The M6 motorway runs from junction 19 of the M1 at the Catthorpe Interchange, near Rugby via Birmingham then heads north, passing Manchester, Preston, Carlisle and terminating at the Gretna junction (J45). Here, just short of the Scottish border it becomes the A74(M) which continues to Glasgow. The M6 is the longest motorway in the United Kingdom and one of the busiest. It incorporates the first length of motorway opened in the UK and forms part of a motorway "Backbone of Britain", running north-south between London and Glasgow via the industrial North of England. It is also part of the east-west route between the midlands and the east coast ports. The section from the M1 to the M6 Toll split near Birmingham forms part of the unsigned E-road and the section from the M6 Toll and the M42 forms part of .
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