"Sark Bridge spans Anglo-Scottish border a little to the south of Gretna, and today carries the B7076 into Scotland. It is one of the numerous bridges built by Thomas Telford as part of the upgrades to the Carlisle to Glasgow road that he oversaw in the 1810s. His original bridge was only wide enough for one lane of modern traffic, and was tasked with carrying the A74 when the routes were first classified in 1922. Circa 1960, when still part of the A74, it was supplemented by a temporary steel Bailey bridge alongside for northbound traffic, with the old bridge used for southbound traffic. This set-up remained when the road was demoted on completion of the A74 Gretna bypass in 1973 and its upgrade to motorway in 1992. Finally the Telford bridge was sensitively widened in 2001, winning a Saltire award, and the Bailey bridge removed". Source: sabre-roads.org.uk/wiki/index.php?title=Sark_Bridge