The crash happened shortly after 1pm at the intersection of Breadings Road and SH1.
The road is currently closed and diversions are in place for all traffic. Drivers are advised to follow instructions of traffic road crews, allow extra time for their journey and avoid the area if they can.
The Police Serious Crash Unit is attending.
People can get information on state highway roadworks, delays and detours at these places:
- NZ Transport Agency's travel and traffic page.
- Transport Agency Canterbury West Coast Twitter updates
- Transport Agency Facebook South Island
- Call 0800 4 HIGHWAYS 0800 44 44 49