A St John Ambulance spokeswoman said a person with minor injuries was taken by ambulance to Hawke's Bay Hospital.
Fire and Emergency New Zealand also helped with scene protection.
Then three people sustained minor injuries after a car crashed into a power pole on Mill Rd, Clive, about 1.10am on Wednesday.
Police said power lines came down as a result of the crash between Richmond Rd and Lawn Rd.
Two hours later, nobody was injured after a car crashed down a bank off State Highway 5, near Te Haroto.
Police, fire crews and two ambulances attended the crash close to the Te Haroto summit about 3.15am on Wednesday.
A police spokeswoman said contractors had been called to fix a broken road sign.