Breydon Bridge on the A47 was closed in both directions after two cars crashed.
A black BMW five series and a blue Fiat Punto were involved in a crash at about 5.30pm on Saturday, November 10, said.
The BMW driver, A man in his 20s, was treated at the scene before being taken to hospital.
The driver of the Fiat Punto is female and also in her 20s.
Police had initially said that the crash also involved an ambulance.
But the East of England Ambulance Service clarified that their vehicle was not directly involved. They said that the ambulance crew had seen the crash happen behind them, so stopped and assessed the patients at the scene.
Police tweeted at just before 8pm that the road had re-opened.
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