|Length:||12 miles (19.3 km)|
|Route outline (key)|
The motorway is uncompleted, with an extension towards Bolton mooted. A bridge under M61 was constricted at the same time as that motorway in order to provide for M58's planned eastern terminus. In November 2016, it was reported that the government revived plans for a link between the M58 and the M61, although the DfT dismissed those reports.
Sections of the motorway started life as the A506 Regional Road before being upgraded.
Main Article: Orrell Interchange
Orrell Interchange is the current eastern terminus of the M58 and provides connections to both Skelmersdale and Wigan (via the A577). The link to Wigan is a temporary addition, which would have been removed had the eastern extension of the M58 to bypass Wigan and link into the M61 been constructed.
Main Article: Pimbo Interchange
Pimbo Interchange provides the eastern access to Skelmersdale New Town from the M6 and Wigan. When it originally opened it was part of the A506 and was upgraded to motorway later. At this time the eastbound to northbound sliproad was closed, meaning to travel north requires a full circuit of the unusually laid out junction. There is a "give way" line that traffic wishing to access the motorway must cross.
Main Article: Switch Island
Switch Island is a heavily modified roundabout interchange near Aintree. It is the terminus of two motorways, the M57 and M58, and is also the terminus of the A5036. The A59 also passes through this junction. It was originally a normal roundabout, but has since been modified several times and can only be described as a sprawling nightmare for anyone who has to cross it.
Since 2011, none of the M58 is lit except for the approaches to both terminal junctions.