Middlesex County OPP say eight vehicles were involved in a crash on Highway 401 at Dorchester Road on Monday.

Around 5:17 p.m., emergency responders were called to a multi-vehicle collision in the westbound lanes of the 401, near the Dorchester Road off ramp.

Eight vehicles were involved, with several people injured, say police.

Debris and damaged vehicles were blocking all three lanes of the highway, which remained closed until approximately 7:30 p.m.

OPP say the investigation has revealed that a white Ford pickup truck, driven by a 21-year-old male, from London, collided with a silver Honda car, in the fast lane, causing chain reaction collisions involving six additional vehicles. 

The Honda, and the additional vehicles, had been merging due to lane restrictions from nearby construction and had either been stopped or travelling very slowly on the highway, say police.

The driver of the white Ford pickup truck suffered non-life threatening injuries. 

The driver of the silver Honda, a 65-year-old male, from London, had to be extricated from the vehicle.  He was transported to hospital by ambulance with non-life threatening injuries.

The silver Honda car struck the rear of a white Honda car, the three occupants of which (a 22-year-old female, a 57-year-old female, and a 66-year-old male, all from Northville, Mich.) were transported to hospital with non-life threatening injuries.

The white Honda car struck a blue Dodge car, which struck a white Volvo transport truck.  Neither of those drivers (lone occupants) was injured.

The white Honda car also struck a brown Porsche car (with two occupants), which in turn, rear-ended a white Nissan car, and struck a silver Ford SUV.  None of the four occupants of the three vehicles were injured.

The driver of the white Ford pickup truck has been charged with careless driving.