One person has been rushed to hospital after falling off a small motorcycle that was being towed by a car on the eastbound express lanes of Highway 401.
Police say the accident happened just before 5 p.m. on Sunday afternoon.
The motorcycle started to sway uncontrollably and the rider fell onto the highway, near Dixie Road.
Three lanes of traffic remained closed for about two hours.
Police are still investigating.
With files from CTV Toronto