The crash happened about 5pm at the intersection of Henley-Berwick Rd and State Highway 1, near Henley.
The person with serious injuries was transported to Dunedin Hospital by ambulance and two other people were treated for minor injuries at the scene.
Police said today they wanted to speak to anyone who witnessed the crash or had information useful to the investigation.
The highway was closed for several hours and traffic was diverted.
The Serious Crash Unit is investigating the cause of the crash.
People with information could contact Dunedin police on 03 4714800.
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I hope all involved make a speedy and full recovery.
I don't know who is in charge of the diversions, but again heavy trucks were being diverted across the old single lane bridge at Henley, with a 5000kg gross weight limit. Truck & trailer units could be as much as 40 tons if fully loaded, 8 times over the limit. I did flag one truck driver down heading south before the bridge and warn him of the limit, but he carried on as soon as I left him. I guess the crumpets had to get through...
The patchwork of recent repairs to the bridge deck have already had to be re-fixed once after only a short couple of months of use. They won't be lasting long at this rate and council might have to do a decent repair job, third time around.