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 (Republic of Ireland) the Dublin Port Tunnel work. There are toll fees for use of the motorway between junctions 7 and 10, the section which forms the Drogheda bypass. Work began in 2004 on a bypass of Dundalk, and was completed three months ahead of schedule in 2005, extending the motorway to just south of the border. Construction finished in 2007 on a cross-border stretch of grade-separated dual-carriageway linking the northern end of the M1 with the A1 near Newry in County Armagh. This was opened to traffic on 2 August 2007. Its length is 14 km, 4.6 km north of the border