M90 motorway
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The M90 motorway is a major road in Scotland. It runs from Inverkeithing, at the north end of the Forth Road Bridge, to Perth, passing Dunfermline, Cowdenbeath and Kinross on the way. It is Scotland's - and the UK's - most northernly motorway, the northernmost point on its spur into the western suburbs of Perth at Broxden.
The M90's arguably most impressive engineering feature is the Friarton Bridge in Perth, a tall concrete pillared structure which traverses the River Tay. The bridge carries eastbound traffic from Broxden towards Dundee and along the Firth of Tay.
The road constitutes most of the southernly part of the crucial A90 corridor from Edinburgh, through Perth, Dundee and Aberdeen to Fraserburgh along Scotland's North Sea coast.
The M90 is considered one of the UK's most sub-standard motorways. Junctions 1 and 2 share a tiny common sliproad, forcing a conflict between entering and leaving traffic at the junction with the A823(M). It lacks hard shoulders for an eight-mile section instead having laybys at quarter-mile intervals, and also has the tightest corner on the UK motorway network, for which traffic is forced to slow.