Preston By-pass Preston By-pass The Preston Bypass was Britain’s first motorway. It was designed and engineered by Lancashire County Council surveyor James Drake as part of a larger initiative to create a north-south motorway network that would later form part of the M6 motorway. The bypass was opened on 5 December 1958 by the Prime Minister, Harold Macmillan. Nearly £3 million was spent in its construction. The original -mile () motorway ran around the east side of Preston between Bamber Bridge (now the M6, Junction 29) and Broughton (now the M55, Junction 1) and crosses over the River Ribble at Samlesbury at
M6 motorway (Ireland) initially opened as dual-carriageway and previously formed part of the N6, while other sections were opened as motorway. In chronological order, the various sections opened as follows (status on opening in brackets): From 24 September 2008, motorway regulations were applied from Kinnegad to the eastern end of the Athlone bypass. The Kinnegad-Athlone scheme was signed as a motorway (and numbered "M6"). Its road markings were already appropriate to a motorway prior to the change in designation coming into effect; however, motorway regulations were not in force and the speed limit was 100 km/h until 24 September of that year. Construction