Boroughbridge is home to probably the most renumbered road in Great Britain, originally the crossroads of the A1, which followed the Great North Road, and A66, which followed Dere Street.
The road to Green Hammerton, at various times, has been numbered: A66 (April 1922 - June 1924), A1079 (June 1924 - 193?), A1074 (193? - ), A167 and A1167 and is now B6265.
The A1 Boroughbridge bypass was opened on 22 November 1963 by the Chairman of North Riding Council. Work had started in Summer 1961 and forecast cost was £1.6million. This Western bypass was first proposed in 1951 when the 1938 Eastern bypass proposals were scrapped.
The North of Boroughbridge bypass to Dishforth crossroads section began in May 1959. It was planned to cost £160,000 and to open in early 1960.
South
The 3.25-mile section from Allerton to Boroughbridge, known as the Improvement from Allerton to Boroughbridge, cost £586,000. It opened in November 1960, and was built by A. Monk and Co. Ltd.