A crash involving two vehicles closed a main route between Wiarton and Hepworth on Tuesday.
Emergency crews were called to the collision on Highway 6 at Shepard Lake Road in South Bruce Penunsula just before 9 a.m. on Tuesday. Grey Bruce OPP blocked off the highway between North Diagonal Road and Spring Creek Road while investigators were on scene.
According to police, four people were injured and taken to hospital. One had to be airlifted to a trauma centre with non-life threatening injuries.
"As a result of the investigation an 85-year-old from New Hamburg was charged with careless driving," police said.
Highway 6 has since re-opened.
Anyone with information about the collision is asked to call police at 1-888-310-1122.