Senior Constable Lox Kellas, of Portobello, said Portobello Rd had a sheen after the rain, as it followed a long dry spell.
A Dunedin woman driving towards Portobello sustained minor injuries when she lost control of her vehicle near Glenfalloch about 12.20pm. It appeared road conditions played a part.
The car left the road and flipped upside down, landing in Otago Harbour.
Snr Const Kellas said there was also a minor crash on Highcliff Rd yesterday, involving a car hitting a bank, but he did not have details.
Earlier, a car hit a power pole in South Rd, Dunedin, near the Southern Cemetery, about 11.20am. A St John spokeswoman said the sole male occupant was taken to Dunedin Hospital after he was extracted from the vehicle. She did not believe his injuries were serious.
Senior Sergeant Darryl Lennane, of Dunedin, said there was also a minor nose-to-tail crash on Barnes Dr, Caversham, about 12.30pm. No-one was hurt.
On Saturday, about 4.30pm, police attended a crash on Three Mile Hill Rd. The 58-year-old male driver's vehicle had slid into a bank and rolled. A St John spokeswoman said the ambulance service attended the crash, but there were no injuries.
Snr Sgt Lennane said it was too soon to say whether rain played a part in the crashes, but the conditions made the roads more dangerous and drivers needed to take care.
