Three people were sent to hospital after a three-vehicle crash involving a transport truck on Manning Road.
Tecumseh OPP say the collision took place on Manning at Baseline Road around 5:25 p.m. Monday.
Police say a northbound van and car began to slow down on Manning when a tractor trailer failed to stop and rear-ended both of the slowing vehicles.
A female driver was sent to hospital with serious injuries. Another driver and passenger had minor injuries.
Police closed Manning Road between County Road 42 and the 401 while police investigate this incident.
Charges are pending, say police.