A coroner has been unable to determine why a driver who caused a fatal crash on the West Tamar Highway had crossed onto the incorrect side of the road.
Daniel Peter Swan died from multiple blunt traumatic injuries when an oncoming vehicle smashed into his Toyota Hilux at Loira on May 13, 2018.
Graeme John Stronach was driving a Toyota Landcruiser in the opposite direction to the 28-year-old when he veered onto the wrong side of the road.
Coroner Simon Cooper said accident reconstruction showed Mr Swan steered his Hilux to the left of his lane after seeing Stronach's vehicle coming towards him.
"However, he was unable to avoid Mr Stronach's Landcruiser and the two vehicles collided. Both vehicles were effectively destroyed," Coroner Cooper said.
Mr Swan died shortly after emergency services arrived at the scene.
Investigators were unable to interview Stronach until a month after the crash because he was "very badly injured".
Stronach said had no memory of the crash and was unable to explain why his vehicle had crossed to the wrong side of the road.
Mr Swan's mother Cheryl said she was disappointed the coroner made no recommendations.
Stronach pleaded guilty to failing to keep left of the dividing line. He was given the maximum penalty for the charge - a $1630 fine and three demerit points.
Stronach was diagnosed with sleep apnoea five months after the crash, but Coroner Cooper said there was no evidence he had the condition on Mother's Day in 2018.
Ms Swan said she would like to speak to other victim's families to hear their stories.