The A823(M) is a tiny spur from the M90, just north of the Forth Road Bridge, that connects South Dunfermline to the river crossing and the motorway network.
It crosses cattle grids and untamed moorland, it climbs 1-in-4 hills and plummets through hairpin bends, it runs single-track through woodland and historic villages. It's rugged and beautiful. Is it really the A39?