Mr Hills said in one crash a woman bound for Waikato lost control and was involved in a minor collision with an oncoming truck.
Soon after, another vehicle travelling towards Tauranga also lost control due to the wet conditions on the highway.
Mr Hills said people were driving too fast for the conditions.
"Driving too fast doesn't mean driving to the speed limit," he said. "In wet weather conditions people need to slow down and take extra care on the greasy roads."
Te Puke St John station manager Simon Campbell said ambulances from his station also attended two crashes.
The first was a single vehicle crash where a car went down a bank at Arawa Ave, Maketu at 11.21am.
Four people were treated for minor injuries, none were transported to hospital.
In the second crash a car rolled on State Highway 2 south of Te Puke at 12.25pm. One person was taken to Tauranga Hospital with minor injuries.