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 the above schemes, the Highways Agency also plans to add capacity and improve flows on the following sections of motorway in the longer term. Plans to dual the A421 from Junction 13 to Milton Keynes and to add capacity to Junction 10a on the Luton spur are being developed. !scope=col|mile !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 Stansted Airport, Dartford, M11, M20 The M1 is the only UK motorway to use transition curves (spirals) to connect straights to curves (circles) as is usual with railways. This was found to be unnecessary and curves connect