A 40-year-old man is facing charges related to impaired driving following a fatal crash on Highway 20 near Sainte-Julie, east of Montreal.

According to Sgt. Audrey-Anne Bilodeau, the suspect's car was travelling eastbound in the left lane and the victim's car in the right lane.

As they approached a construction zone around 2 a.m., the suspect was forced to merge into the right lane, Bilodeau said.

Investigators believe that while the suspect was merging, he bumped the victim's car, which then collided with a parked signalling truck.

The driver of the second car, a man in his 30s, was pronounced dead at the scene.

The driver of the other car wound up in the right ditch. That driver was not hurt but officers brought him in to take a breath sample, Bilodeau said.

He failed the alcohol test and will remain detained until a court appearance later today, where he will be charged.

The highway was closed eastbound between kilometres 102 and 105 for hours due to the investigation, but was reopened around 9 a.m.

Crash Highway 20 Sainte-Julie

Firefighters at the scene of the collision early Monday morning. (Gabriel Gervais/Radio-Canada)