M74

The A74(M) and M74 form a major motorway in Scotland, connecting it to England. The routes connect the M8 motorway in central Glasgow to the Scottish-English border at Gretna, part of the unsigned international E-road network E05. The road passes through several Glasgow districts and towns in the Clyde Valley before bypassing Moffat and Lockerbie, shortly entering England before becoming the M6 near Longtown. The road has a complex history, originally built as the A74, then upgraded to dual carriageway and later to motorway standard in stages between the 1960s and 1987.learn more on wikipedia