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Police were called to the scene of two truck crashes near Tekapo in South Canterbury this morning.
A truck and trailer tipped in icy conditions on State Highway 8 between Tekapo and Twizel at 12.10am on Wednesday.
Police said a short time later a second truck crashed into the trailer that had tipped over at the same location.
It has been a cold and icy start to the day for many parts of the south.
Some people are waking up to temperatures as low as minus -10 deg C.
Police are asking motorists to take care, drive to the conditions and delay travel if possible, particularly in Dunedin's hilly suburbs.