A fire engine was responding to an incident just after 11am on October 13.
It was involved in a collision with three other vehicles, including a HGV, car and van, on the northbound carriageway of the A43, near Barford Bridge.
Three firefighters have since been taken to Kettering General Hospital and received precautionary checks before returning home.
The incident is now being investigated by Northamptonshire Police.
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