All people were out of the vehicle and no injuries have been reported, police said.
The two crashes follow a fatal crash in Maungatapu last night.
Police divers were this morning searching for a vehicle believed to have gone off Maungatapu Bridge on State Highway 29A last night.
In a statement, police said the dive squad had found a vehicle and the driver's body was also found inside the vehicle.
A large blue crane with a chain attached lifted a bluish grey double-cab ute with a white canopy from the water.
The road between Maungatapu and the Baypark roundabout reopened this afternoon.