M55 motorway meet junction 4, where the motorway ends and becomes the A5230. The western part of the M55, and the first few hundred metres of the A5230, occupy the route of the old Blackpool Branch railway line. The first motorway constructed in Great Britain was the M6 Preston Bypass, opened in 1958. This ran from the current M6 junction 29 to the M55 junction 1. It was built as a two-lane route. In 1965 the M6 was extended north from what is the current day junction 32 to meet the Lancaster Bypass, and the M6 junction was rebuilt to its current
M6 motorway (Ireland) 56-km section of M6 began in 2007. This section lies between the town of Ballinasloe and Galway City, running between junctions 14 and 20 on the M6 corridor. The road is a tolled Public-private partnership scheme, and opened under motorway restrictions. The PPP contract was awarded to N6 Concession Limited in April 2007 which comprised FCC Construction S.A. and Itinere Infraestructuras (both major companies from Spain) and P.J. Hegarty & Sons who are a leading Irish Contractor. The contract was signed on 4 April 2007 for 30 years from that date. The construction took approximately 3 years to be completed