Five people were injured Thursday night after a collision on Weston Road, just south of Sheppard Ave.
It happened just before 11 o'clock, when one vehicle rear ended the other, causing it to flip over once.
A man in his 30's who was driving the car that was rear-ended, suffered serious chest injuries. He and two others were taken to hospital.
The driver of the first vehicle was taken into custody and charged with impaired driving an dangerous driving.