The M90 is a motorway in Scotland. It runs from junction 1a of the M9, south of the Queensferry Crossing, to Perth, passing Dunfermline and Kinross on the way. It is the most northerly motorway in the United Kingdom, the northernmost point being a spur into the western suburbs of Perth at Broxden.

As part of the Queensferry Crossing scheme, the M90 was extended southwards across the Firth of Forth over a new cable-stayed bridge in 2017. A short stretch of A90 dual carriageway connects the two parts of M90 - the short M90 section from the M9 and the much longer M90 section that crosses the Queensferry Crossing and extends north to the outskirts of Perth.

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