M18 motorway (Great Britain) and 12 June 2015. The M18 was originally to be part of the M1, but it was decided to route the M1 towards Leeds instead of Doncaster, and the routing of what would have been the M1 east of Sheffield became the M18. Data from driver location signs are used to provide distance and carriageway identifier information. The location sequence is a continuation of the M1 location sequence. !scope=col|miles !scope=col|km !scope=col abbr="Southbound"|Southbound exits (B carriageway) !scope=col|Junction !scope=col abbr="Northbound"|Northbound exits (A carriageway) !scope=col|Coordinates M18 motorway (Great Britain) The M18 is a motorway in Yorkshire, England. It runs from the east of
M1 motorway (Northern Ireland) construction, some work on which had been undertaken between 1955 and 1957. These two plans were eventually upgraded into plans for the M1 by 1958. Construction began 1957 on the first bridge and subsequently the first section of the motorway. In 1964, the Northern Ireland Government announced plans for an extensive route of motorways which saw the M1 now planned to go to Dungannon. The M1 is the only motorway in Northern Ireland completed to its full planned length The road was constructed in stages between 1962 and 1968: Prior to the opening the RUC traffic division ran a publicity