Scotland's shortest motorway, and also the highest numbered in the UK, the M898 connects the M8 motorway to the A898 southern approach to the Erskine Bridge. It is only ¾ mile (1.2 km) in length and opened in 1970, a few months before the bridge. It was designed by Freeman Fox & Partners and built by Glasgow-based Whatlings Ltd at a cost of £2.1 million.
At its northern end, the Spectacles Interchange (built in the shape of a rather elongated pair of spectacles) connects the M898 with the A726 into Erskine and the B815 to Bishopton. Here there was once a toll plaza for the Erskine Bridge, but this was removed in 2006 when tolls were abandoned.