The road received a substantial upgrade in the early 19th century under the direction of Thomas Telford, who made significant engineering improvements, including a new route over the Beattock Summit and the Metal Bridge just in England just south of the border.
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As of 2008, the A74(M) motorway extends southwards to the northern terminus of the M6, at the Scottish border, so that the two are now contiguous, and was extended northwards in the mid-1990s as far as the Glasgow suburb of Tollcross.
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In August 2008, when the A74 was still an all-purpose road across the Cumberland Gap, the Highways Agency took out a special order to ban cyclists and pedestrians from the route, advising them to use the A7 to Longtown instead.
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