B.C.'s Sea-to-Sky Highway 99 has reopened, but drivers are warned to expect congestion.

It had been closed in both directions since Thursday morning after a fatal head-on collision near Whistler.

RCMP have confirmed a northbound pickup truck and a southbound SUV were involved in the crash just north of the Callaghan Valley Road around 9 a.m. PT.

The driver of the pickup was killed when the vehicle burst into flames. The driver of the SUV was taken to hospital with non-life-threatening injuries.

Police have not released the identity of anyone involved, but have confirmed there were no passengers in either vehicle.

It was snowing lightly at the time, but Staff Sgt. Steve LeClair said it was too early to say what might have caused the crash.

The shut down comes after the highway was closed on Wednesday night for several hours after a tree fell across it, sending several passengers to hospital with minor injuries.