It took firefighters an hour to free the teenager from the wreckage.
The patient was taken to hospital in a serious condition.
In Waikato, a woman is in a critical condition after being struck by a vehicle near Rotorua this morning.
Police were called after the pedestrian was found on SH33 near Whangamarino Primary School about 3.30am.
The woman was taken to Rotorua Hospital in a critical condition.
Police said the highway would be closed for some time while the serious crash unit carried out its investigation.
Diversions were in place on SH33 by Haumurana Rd from the Rotorua end and SH33/SH2 at the Paengaroa/Tauranga end.
Motorists should expect lengthy delays.