The intersection of County Road 3 and County Road 24 has reopened after a serious collision.
Dufferin County OPP say they and other emergency crews were called to the scene around 6 pm Monday in East Garafraxa.
A tractor trailer collided with a car and then fled the scene.
Two people in the car suffered serious injuries.
Investigators are looking to speak with any witnesses who may be able to identify the tractor trailer or the driver.