A woman and two children have been killed in a crash north of Westlock and a male driver is facing charges.

The crash occurred on Thursday morning, about 85 km north of the community on Highway 44.

A 23-year-old woman and two children, aged four and two, were all killed in the head-on crash between a car and a truck

Two other people in the Ford Focus were taken to hospital.

The male driver of the truck was seriously injured in the crash and is facing charges.

Police say the conditions were extremely treacherous due to weather at the time of the crash.