It runs from High Street, Glasgow to Newbridge in Edinburgh.

As well as the aforementioned neighbourhoods bearing the road names, the A89 also passes through The Calton, northern Parkhead, Sandyhills and Garrowhill.

Following major roadworks in the mid-2010s, the A89 now merges with the A8 Edinburgh Road (which has another meeting point at Glasgow Cross) for a short stretch near Swinton before a large roundabout leads the routes to split again, with the A8 feeding an interchange for the M8 and M73 motorways while the A89 passes under the M73 as Coatbridge Road, whereupon a further roundabout then reinstates the A8 as an alternative route along its old path, parallel to the new M8).

At this point, the road continues east as the A8 towards Edinburgh Airport, the A720 bypass then into the city itself.

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