Craigton Interchange, junction 30 (formerly junction 11) of the M8, lies towards the western end of the motorway and is where a significant chunk of the traffic that remains on the motorway disappears. Considering the congestion found on the 5-lane sections in Glasgow city centre, the two lane M8 at Craigton is already lightly trafficked, but with roughly half the traffic turning off onto the M898 it becomes clearer still. The reason so much traffic turns off here is that it is heading across the Clyde via the Erskine Bridge, the lowest crossing point of the river, on its way north and west on the A82.
The junction itself is a directional T design, with a full set of single lane sliproads. However, when first built these sliproads carried two narrow lanes without hard shoulders, a thought that seems quite scary when travelling through the junction at speed today! Of the two sliproads which cross the M8 mainline, the westbound offslip passes under the M8, whilst the onslip crosses over the top. In each case, the sinle lane sliproads merge to form the D2M M898 leading to the A898 across the Erskine Bridge.