Dead Vic tradie's family speak of anguish

The mother of a tradie hit and killed by a drug-affected driver while being sick on the side of a Melbourne freeway says she will be "broken till the day I die".

Tara Brennan, 29, has pleaded guilty to culpable driving causing death and possessing a drug of dependence after crashing into 31-year-old Alan Dunlop as he crouched beside his cousin's car stopped in an emergency lane of the Western Ring Road in May 2016.

In Victoria's County Court on Tuesday, Mr Dunlop's mother, Karen, cried as she told Judge Duncan Allen "I will always be broken till the day I die".

Brennan tested positive to methamphetamine following the crash, with the drug also found in her car, the court was told.

She crashed her car while travelling at 83km/h and told another driver who stopped to help she had smoked weed the day before.

That drug use had not been linked to the accident.

Mr Dunlop had been in his cousin's car but the pair stopped in the emergency lane of the Western Ring Road at Sunshine West so he could be ill.

The father-of-three died at the scene after becoming trapped under Brennan's car.

It was the day before Mother's Day.

"Every day is hard but Mother's Day is the worst," Mrs Dunlop said.

"I often cry myself to sleep. I hate getting up in the morning.

"I feel so heartbroken knowing Alan isn't coming home."

The plea hearing continues.