The 401 eastbound express lanes were closed for more than an hour through Avenue road after a collision involving a motorcycle.
OPP at the scene say the traffic slowed up in front of the rider, and she slammed into the back of an SUV.
He was then thrown from the bike.
The 28 year old man was taken to hosital with what were first believed to be serious injuries. Those were later downgraded to only minor.
There's no word yet on charges.
The road re-opened shortly after 3:30.