"The impact was such that it was remarkable no one was seriously injured or killed."
A firefighter crawled into the vehicle with the trapped man and ensured he would not move when the vehicle was winched out of the drain back on the road.
Whangarei firefighter Senior Station Officer Paul Ballantine said paramedics assessed the driver and stabilised him before the car was righted and cutting equipment was used to remove the doors and the roof.
He was taken to Whangarei Hospital with moderate head and leg injuries. The other driver did not need further treatment.
Mr Goodall said: "In the lead up to Christmas there is traditionally more traffic and with more traffic on the roads there are more crashes. I urge people to take care."
Northbound traffic was diverted through Otaika Valley Rd. One regular commuter from Waipu said she followed Cemetery Rd, which was congested with traffic.
It took her two hours to reach Whangarei compared to her normal 30 minute trip.