They also treated three patients in a minor condition on the scene.
A police spokeswoman said the incident involved two cars.
The police spokeswoman said the road had been cleared by about 7pm.
The Te Whatu Ora Te Matau a Māui, Hawke's Bay spokeswoman said a man in his 50s had since been discharged after being taken to Hawke's Bay Hospital in a serious condition following a crash on Clive Bridge, Clive, on Saturday evening
A woman in her 30s moderately injured in the Clive crash was assessed and discharged from the hospital.
Meanwhile, a woman in her 40s remains in a critical condition at Hawke's Bay Hospital after a serious crash near Pakipaki School, at the intersection of SH2 and Turamoe Rd, on July 20.
A man in his 60s also remains in a critical condition at Hawke's Bay Hospital after a crash on July 12 in Pakowhai, on the outskirts of Hastings, that killed a 24-year-old woman.
