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Southbar Interchange

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Southbar Interchange
Location Map ( geo)
Approaching the A8 Greenock Road overbridge - Geograph - 2416426.jpg
The former interchange in 2011
Cameraicon.png View gallery (13)
Highway Authority
Transport Scotland
Junction Type
modified fork
Roads Joined
M8, A8

The Southbar Interchange was, for a time, the terminus of the M8, before it was extended west past the Erskine Bridge M898 turn off to its current West Ferry Interchange terminus in the 1970s. These is also some evidence that the junction remained open for a brief period, as the extension was completed in two stages.

The junction layout on the 1974 OS One Inch map
The first junction layout as the western terminus of the M8 in 1968
And from 1965, just before the motorway arrived

The first junction on the site was an at grade junction where the mainline flowed from the M8 into the westbound A8, with the city bound A8 giving way, presumably at traffic signals. The M8 extension was then started, and completed in two sections, the first just as far as the M898 at Craigton Interchange. Therefore, in order to maintain the traffic flow from the motorway onto the A8 they needed to maintain a junction at this point. This took the form of a simple slip from the westbound M8 onto the A8, but for eastbound traffic they needed to build a loop which started under the new overbridge, and curved through the field to the north east of the junction to meet the M8 before the bridge started. These two sliproads also allowed traffic flows to be maintained during the construction process.

With the completion of the motorway through to West Ferry Interchange in the mid 1970s, the junction at Southbar was no longer really needed. It is still shown in use on the 1976 OS Landranger map, but not given a number whilst the motorway is complete through to West Ferry. By the 1980s the junction is marked as closed, and it was later removed, the land being returned to nature on the south side, whilst the site of the loop has been returned to the farmer.

Plans for a new junction

In 2016, plans were made for a new junction at the site, with legal orders being published in August 2016.

The rebuilt junction, partially using the original offslip but otherwise a new design, opened in late 2019.

The two dumbbell roundabouts themselves are named, as the Commonside Roundabout and Craigmuir Roundabout.


Route To Notes


Erskine Bridge (M898), Erskine


Glasgow, Airport, Paisley


Greenock, Bishopstone




Glasgow, Airport, Paisley

Strip Maps


Southbar Interchange
Related Pictures
View gallery (13)
Approaching the A8 Greenock Road overbridge - Geograph - 2416426.jpgSouthbar Interchange 1976.pngCommonside Roundabout(1).JPGCommonside Roundabout(3).JPGCraigmuir Roundabout(3).JPG
Other nearby junctions
Anderston Interchange • Anniesland Cross • Baillieston Interchange • Barrachnie Crossroads • Barrhead Road Interchange • Bearsden Cross • Birkenshaw Roundabout (Glasgow) • Blochairn Interchange • Bridgeton Junction • Broomhouse Roundabout • Canniesburn Toll • Cardonald Interchange • Carmyle Avenue Interchange • Charing Cross (Glasgow) • Cowcaddens • Cumbernauld Road Interchange • Daldowie Interchange • Dobbies Loan • Dumbreck Interchange • Dumbreck Road Interchange • Easterhouse Road Interchange • Ferry Road Junction • Finnieston Street Junction • Fullarton Road Interchange • Garscube Cross • Glasgow Central • Glasgow Cross • Gorbals Crossroads • Helen Street Interchange • James Street • Kingston Junction • Maryville Interchange • New Edinburgh Road • Nitshill Interchange • Parkhead • Plantation Road Interchange • Polmadie Road Junction • Port Dundas Interchange • Provan Interchange • Queen's Cross • Robroyston Junction • Scotstoun • Seaward Street Interchange • Shettleston Crossroads • Stepps Road Interchange • Summerston Interchange • Tollcross • Townhead Interchange • West Street Interchange • Westerhouse Road Interchange • Whiteinch Interchange
Junctions on the M8
Hermiston • Newbridge • 2 Claylands • 3 Detchmont • 3A Starlaw • 4 Whitburn  • 4A Heartlands • 5 Shotts • 6 Newhouse • 6A Chapelhall • 7 Eurocentral • 7A Shawhead • 8 Baillieston • 9 Easterhouse Rd • 10 Westerhouse Rd • 11 Stepps Rd • 12 Cumbernauld Rd • 13 Provan • 14 Blochairn • 15 Townhead • 16 Dobbies Loan • Port Dundas • 17 & 18 Charing Cross • 18 & 19 Anderston • 20 West Street • 21 Seaward St • 22 Plantation Rd • 23 Dumbreck Rd • 24 Helen St • 25 Cardonald • 25A Braehead • 26 Hillington • 27 Arkleston • 28 Glasgow Airport • 28A & 29 St James' • 29A Southbar • 30 Craigton • 31 West Ferry
Junctions on the A8
West End • Drumbrae Junction • Maybury Junction  • Gogar Roundabout  • Airport Junction  • Newbridge Roundabout  • Newhouse Junction • Chapelhall Junction  • Eurocentral Junction  • Shawhead Junction  • Bargeddie Junction  • Baillieston Interchange  • Swinton Roundabout  • Glasgow Cross  • Gorbals Crossroads  • Seaward Street Interchange  • Shieldhall Roundabout  • Renfrew  • Red Smiddy Roundabout  • Barrangary Roundabout  • Chestnut Roundabout  • West Ferry Interchange  • Langbank Roundabout  • Woodhall Roundabout  • Newark Roundabout  • Cartsdyke Roundabout  • Bullring Roundabout  • Greenock

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