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Senior safety engineer Roy Johnston said the agency would assess the layout and safety of the Arrow Junction intersection in the coming months.
``The intersection is rated as a medium to high-risk intersection based on its crash history over five years and including Tuesday's serious-injury crash,'' he said.
Tow-truck driver Glen Collins was travelling towards Cromwell on Tuesday morning when a 28-year-old Chinese tourist behind the wheel of a Nissan Tiida allegedly failed to give way at the junction where McDonnell Rd meets State Highway 6.
The driver pulled out in front of Mr Collins' 10-tonne tow truck in an attempt to turn right towards Queenstown.
Mr Collins said he hit the Tiida square-on on the driver's side, knocking the driver unconscious, while the only passenger in the car was uninjured.
The impact from the head-on bumped Mr Collins' truck sideways into a woman in a stationary Holden Colorado giving way to the tow truck, waiting to turn right towards Arrowtown.
Mr Collins said Wakatipu roads were the most dangerous he drove. He said tourist drivers were a ``major, major hazard''.
Mr Johnston said Tuesday's accident was the first serious injury crash in five years in which a person was taken to hospital.
Only the driver of the Nissan Tiida was taken to Queenstown's Lakes District Hospital, where he was kept for observation overnight.
The three others involved were shaken but not physically injured. Queenstown police are considering whether to charge the driver with careless driving.
Between 2013 and 2017 there have been five non-injury crashes and one minor injury crash at Arrow Junction.
The NZTA is also bidding for funding to improve the Tucker Beach Rd intersection with SH6.