Four people have been taken to hospital following a collision between an articulated truck and three cars on SH1, Rangitata Highway, near Hinds this morning.
Canterbury Police said the vehicles were travelling south-bound along SH1 along a section of road where temporary traffic lights had been set up in order for contractors to work in the area.
The cars were understood to have been stationary at the traffic lights when the truck appeared to have collided with the back of the first car, a Holden ute, pushing it into the second, a Subaru Forester, and third, a Toyota Highlander.
Canterbury Police's Serious Crash Unit and Commercial Vehicle Investigation Unit are on site assessing the scene.
The male driver and sole occupant of the articulated truck was uninjured.