Two cars collided head-on in St. Jacobs Friday night.
It happened around 6:15 p.m. on Highway 85, just south of Sawmill Road.
The force of the crash caused significant damage to both cars.
Waterloo Regional Police say one of the drivers had a medical emergency which caused the collision.
Two people were taken to hospital with non-life threatening injuries.
One of the drivers has been charged with careless driving.