A woman was arrested for impaired driving after losing control of her vehicle and flipping it over on a downtown Toronto highway on Saturday afternoon.Emergency crews were called to the southbound ramp of the Don Valley Parkway that leads to the westbound Gardiner Expressway just before 1:30 p.m. for reports of a single-vehicle collision.Paramedics say a woman in her late 30s was taken to a local trauma centre with minor injuries.Police later confirmed that the driver was arrested for impaired driving and taken to the hospital for treatment.No other injuries were reported.