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
Transport in Leeds principal hub of the national motorway network, with the M1 and M62 intersecting in the south east of the city and the A1(M) running along its eastern border. The M1 joins the A1(M) in east Leeds, creating a semi-orbital motorway consisting of the M62, M1 and A1(M) motorways around the south and east of the city. The M621 carries high volumes of traffic quickly in and out of central Leeds from the M62 and M1. The Inner Ring Road largely carries through traffic across the city, whereas the City Centre Loop distributes local traffic around the city centre. The City