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
M62 motorway 21 metres. The M62 overbridge has a reinforced concrete multi-cellular deck of four spans. Two other pre-stressed reinforced concrete bridges carry slip roads over Longthorpe Lane, the B6135. Another bridge with no motorway access carries Longthorpe Lane over the M1. Two skew tunnels were constructed beneath the original junction between 1996 and 1999. The tunnels, constructed using the cut-and-cover method, are for traffic travelling between the M1 south-bound and the M62 west. The tunnel under the M62 is 147 metres in length. Two contracts were awarded for the section between Lofthouse and Ferrybridge in 1972, and both were completed in