A semi driver charged in a four-vehicle crash that killed three Carrot River teens is heading to trial.

Normand Lavoie’s trial will begin next summer — on June 12, 2017 — at Melfort’s Court of Queen’s Bench.

The Winnipeg man was charged with three counts of criminal negligence causing death and one count of criminal negligence causing bodily harm following the May 3, 2015 fatal crash on Highway 6, about five kilometres south of Spalding, Sask.

A car was stopped in a construction zone when it was rear-ended by a semi-tractor trailer, according to RCMP.

The car was pushed forward into a pickup truck, which then struck a highway flag person before colliding with a construction pilot vehicle.

The three people in the car — 17-year-old Carter Stevenson, 15-year-old Kristian Skalicky and 14-year-old Justin Gaja — were pronounced dead at the scene.

The flag person, a 21-year-old B.C. man, was flown to hospital in Saskatoon with critical injuries.

The drivers of the semi, pickup and pilot vehicle were all taken to hospital in Melfort with minor injuries.

Lavoie’s trial is scheduled to last two weeks.