The A74(M) and M74 form a major motorway in Scotland. Following an extension opened on 28 June 2011, it connects the M8 motorway west of Glasgow to the English border at Gretna, creating a route from the south to the west of the city. In conjunction with the M6 motorway, it forms one of the two major cross-border routes between Scotland and England. It is part of the unsigned international E-road network E05. Although the entire route is usually referred to as the M74, more than half of its length is officially the A74(M); see naming confusion below.