An Adelaide man who twice stabbed a fellow driver in a drug-fuelled road rage murder has been jailed for at least 20 years.
Benjamin Joshua George was on his way to a methadone clinic when 34-year-old Troy McLean's car nudged the back of his at Salisbury, in the city's north, in November 2017.
Sentencing George in the Supreme Court on Friday, Justice David Lovell said the 27-year-old was outraged at the "slight bump" and got out of his car with a knife.
"You were carrying a knife in your car and you were clearly prepared to use it," he said.
"Without warning (you) viciously stabbed Mr McLean in the upper abdomen, piercing his heart."
George then chased Mr McLean around his car and stabbed him in the back, in an attack lasting between 30 and 35 seconds, before he relented.
"You got in your car and left, not caring that you stabbed him," Justice Lovell told George.
Mr McLean got back in his car and tried to drive himself to hospital but collapsed on the way and died three days later, while George was arrested that night.
Around the time of the murder, he had been using methamphetamine, cannabis, heroin, OxyContin, morphine and methadone, in addition to prescription drugs.
He had been on an ice binge and had not slept for several days, when, on the morning of the attack, he took heroin and cough syrup and encountered Mr McLean on his way to the clinic.
Justice Lovell said a traumatic childhood, anxiety and emotional dysregulation contributed to George's propensity to take drugs, which had caused more severe mental health issues.
Now clean and in prison, he said George was remorseful and had shown he had good prospects for rehabilitation.
"You are obviously a different person... I accept this offending is out of character for you if you are drug-free," Justice Lovell said.
But he acknowledged the "lifelong" pain of Mr McLean's family including his young son, who last month told the court George "took someone very special".
"I don't understand why you did what you did and I hate you," the boy said in a statement.
George showed no emotion as Justice Lovell sentenced him to life behind bars with a non-parole period of 20 years.
He will be eligible for parole in 2037.