Fort St. John RCMP believes it was caused by the inexperience of the 19 year old female driver with towing a trailer. 

When police arrived at the scene the driver and the two passengers, a male and female in their early twenties, were being attended to by witnesses, including a medic. The young adults were transported by B.C. Ambulance to the Fort St. John Hospital, but were discharged shortly after. 

They had been travelling from Alaska, although whether they were moving or vacationing has not been disclosed.