One person has been critically injured and choppered to hospital after a crash on a major West Auckland highway.
A section of State Highway 16 is closed and diversions are in place after a serious crash involving a single vehicle near Waimauku.
A motorist was trapped in their vehicle after it crashed into a tree around 1.20pm.
Police say the crash occurred past the Waimauku township heading towards Helensville.
![Emergency services were called to the crash near Waimauku around 1.20pm Monday. Photo / Auckland Rescue Helicopter Trust](https://www.nzherald.co.nz/resizer/v2/VWLYPLIC7HEXJBLZXS3LEA5VDQ.jpg?auth=7283fd6542448153e74d6763ca940d776cffdff292919e1e476e07c73192dada&width=16&height=12&quality=70&smart=true)