A bus driver's spontaneous detour has come to a unplanned halt at a hairpin turn in Dunedin's Northeast Valley.

The driver was about to begin his school run this afternoon and decided to detour up Buccleugh St, a narrow winding road which has been the undoing of a number of buses and trucks over the years.

The Ritchies bus lost traction at a hairpin turn halfway up the road and is now stuck against a crash barrier.

Attempts by a tow truck to move the bus have been unsuccessful.

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The bus was dragged clear of the corner about 5.45pm.