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St James Interchange

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St James Interchange
Location Map ( geo)
A wet St James Interchange in 2006.jpg
A very wet St James Interchange on the Glasgow-bound slip in 2006
Cameraicon.png View gallery (6)
Glasgow Airport
Highway Authority
Transport Scotland
Junction Type
Roundabout Interchange with freeflow slips
Roads Joined
M8, A726, A737
Junctions related to the A726
Junctions related to the A737

St James' Interchange is junction 29 (formerly junction 10) of the M8. It is a substantial roundabout interchange crossed by the A726 and marking the northern end of the A737. It has been changed several times since it first opened in the 1960s, and no includes free-flowing slip roads from the M8 to the A737, which are numbered separately as junction 28A. To further complicate matters, the construction of J28A means that St James Interchange now also forms part of J28, Glasgow Airport Interchange.

The roundabout, which sits above the M8, is egg shaped to accommodate two arms to the south and one to the north of the motorway. To the north, the A726 curves back on itself to navigate around the airport perimeter, while to the south it continues south east into Paisley. The A737, meanwhile, bypasses Paisley to the west. The free flow connection between the A737 and city bound M8 passes to the south of the roundabout, bridging over the A726, and provides two lanes in each direction. While the M8 is notorious for having on and offslips almost meeting, the addition of J28A led to changes to J28. As a result, there are no longer any direct west facing slips for J28, traffic instead having to use the lengthy sliproads, which run outside the A737 slips, between J28 and J29. Heading east, this is perhaps beneficial for traffic heading into the airport, but it does add an extra junction for westbound traffic. These sliproads are two lanes apart from the westbound merge into the M8 slips just before the roundabout, which had been hatched down to a single lane.

The roundabout itself is, perhaps surprisingly, only partially signalised. The two M8 offslips and the southern arm of the A726 have traffic lights controlling access onto the roundabout. There are then two circulatory lanes, with a third on the southern flank between the M8 and A737. The Westbound M8 offslip and northbound A726 have three approach lanes, all other arms have two.


Route To Notes


Greenock, Erskine Bridge (M898)




Irvine, Johnston, RA Hospital


Bishopston (A8), Erskine, Inchinnan


East Kilbride, Paisley
Glasgow Airport Sanderling Parkway


Johnston (A737), Linwood (A761) now A737


Greenock now M8


Glasgow now M8

Johnstone Motorway

Irvine (A737), Johnston, Linwood, East Kilbride now A737

Strip Maps

St James Interchange
Related Pictures
View gallery (6)
St James Interchange 1972.PNGSt James Interchange.PNGA wet St James Interchange in 2006.jpgRoad Sign on A737 (C) Gordon Dowie - Geograph - 1817363.jpgSt James Interchange - Geograph - 4978796.jpg
Junctions on the M8
Hermiston Gait • 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

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