This article is about the unbuilt motorway in Northern Ireland.
For the Scottish motorway, see M8
.For the motorway in the Republic of Ireland, see M8 (Republic of Ireland)
The M8 was a motorway along the Lagan Valley that was proposed in 1964. Its purpose was to distribute traffic heading from Lisburn to Belfast, taking traffic heading to North Down and East Belfast off of the M1 before the M11 traffic from Newry and northern Lisburn merged in.
It ended on the M4 at Stranmillis, where traffic could head north to the Belfast Urban Motorway.
Detailed plans never existed, as the plan was short-lived. It had gone by 1969 due to poor traffic estimates and the removal of the highly-disruptive M4 section north of Stranmillis.