A single-vehicle crash was reported on SH38, Kaingaroa, near Wairapukao Rd, about 2km west of the first crash, about 8.20am, a police spokesman said.
One person with moderate injuries was taken to Rotorua Hospital.
A police spokesman said four crashes mentioned black ice across the region this morning.
“Drivers throughout the wider Bay of Plenty region are being urged to watch for black ice, following several crashes.
“Take care, increase your following distances, and keep your speed down, especially in shaded patches of road.
“If a patch of road looks wet or damp, assume it’s black ice; let your car slow down on its own, and brake gently before you get to a curve,” he said.
More winter driving tips could be found here.