In Mirabel, police say alcohol may have been a factor in a collision that left a 31-year-old man dead.
Around 9 p.m. Monday, one vehicle heading in the wrong direction on Highway 50 collided with another vehicle.
Police said they believe the driver of the first vehicle, Gabriel Carrière, fell asleep while driving.
He was transported to hospital, where he died just before 11 p.m.
The second driver suffered minor injuries.
Early this morning a second collision in the Montreal borough of Pierrefonds-Roxboro, left a man and a woman in their 40s with serious injuries.
Police said the driver lost control of his vehicle before it bounced off two power poles, finally coming to a stop near the intersection of Gouin West Boulevard and Pierre-Lauzon Street.
The man and woman were transported to hospital and police say their lives are not in danger.
Gouin Boulevard between Sunnybrooke Boulevard and Lalande Boulevard will be closed for an undetermined amount of time while police investigate.
Police said alcohol and speed could have been factors in the incident.