A charge of dangerous driving causing bodily harm is pending against a 49-year-old Brampton truck driver from Friday's crash on the 401 near Puce Rd.
Provincial police say a transport truck heading west stopped in a live lane of the 401 around 11:30am after missing the Puce Rd. exit.
Police say the truck driver then began reversing the rig in traffic.
A pickup truck hauling an enclosed work trailer was unable to avoid the transport truck and slammed into the rig's trailer.
Both people in the pickup were taken to hospital, the driver had minor injuries but the passenger suffered serious, non-life threatening injuries.
The crash closed a stretch of the westbound highway for four hours.