The person flown to hospital after yesterday's horror crash near Levin is now in a stable condition.
Two trucks and two cars crashed on State Highway 1 north of Levin about 8.40am
A St John spokesperson told the Herald four people were injured in the crash – including a child, who was seriously injured.
Three of these people have since been discharged but one remains in Palmerston North in a stable condition.
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One of the truck drivers was "very heavily trapped" and with a police spokesperson said he was "lucky to be alive".
The road was closed for a number of hours while the crash was cleared and the Serious Crash Unit investigated. It is now open.