A motorcyclist has died after colliding with a milk tanker south of Ashburton around 2pm on Wednesday afternoon.
The motorcyclist was reportedly dragged away from passersby while his motorcycle was in flames under the tanker following the crash on Maronan Road near State Highway One.
Emergency services say the truck involved is blocking the road and diversions are in place to Northbound traffic.
Christchurch Transport Operations Centre (CTOC) say motorists are advised detours are significant in length and should allow extra travel time.
The Serious Crash Unit is investigating.