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
Princes Motorway for the original route, then run along the route of the current Princes Highway with tunnels bypassing the towns of Heathcote and Waterfall before joining the existing freeway. Princes Motorway The Princes Motorway is a predominately dual carriage untolled motorway that links Sydney to Wollongong and further south through the Illawarra region to . Part of the Australian Highway 1 network, the motorway is designated with the route number M1. The motorway is sometimes known by its previous signposting F6 (Freeway Route 6) and its previous name, the Southern Freeway, which applied to the sections between Waterfall and Bulli Tops