Emergency services were called to the single-vehicle crash in Maori Rd just after 9am.
The occupant of the car was uninjured, a police spokeswoman said.
''It looks like it was caused by ice on the road and the car's gone into the ditch.''
Council transport delivery manager Josh von Pein confirmed the road, which was one of those nominated for calcium magnesium acetate (CMA) treatment, was inspected but not treated.
''The contractor inspected roads around the city this morning and applied grit on some roads,'' he said.
''Maori Rd was inspected but was not treated with CMA.
''The decision about whether to apply grit or CMA is made early each morning throughout winter, based on field inspections by the contractor.''
CMA is a non-corrosive and biodegradable agent that remains effective against ice formation for several nights.
A map showing which roads might be treated can be viewed at http://www.dunedin.govt.nz/services/roads-and-footpaths/gritting.
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I drove along this same road yesterday morning and there was a significant amount of ice. Even though I was travelling at a very low speed I experienced a loss of traction twice in this short patch of road. Other vehicles were also sliding into the gutter from the ice. I do not understand how an inspection of this obviously dangerous section of Maori Road resulted in the decision not to treat with CMA. This poor decision must be a factor in the resulting car crash.