A 33-year-old Oshawa man is in critical condition with serious internal injuries after his motorcycle collided with a car.
The accident occurred shortly before 4 p.m. Tuesday at Bayly Street West and Kitney Drive in Ajax.
Witnesses said a motorcycle was driving eastbound through the intersection on a green light when a westbound Toyota Yaris attempted to make a left turn, hitting the bike.
The driver of the Yaris, a 71-year-old Ajax woman, was not hurt, police said.
The Durham Regional Police say they are looking for the driver of a red truck who stopped eastbound in the intersection when the accident took place.
Anyone with additional information on the accident is urged to contact Detective Constable David Cormack at 905-579-1520.