The man who ploughed into a stationary vehicle on the Central Expressway (CTE), killing four people, was convicted on Tuesday (May 12).
Toh Cheng Yang, 36, was found guilty of causing death by dangerous driving and driving under the influence of drugs.
On National Day in 2013, Toh had driven under the influence of drugs, causing a horrific fatal accident along the CTE.
The four victims were Singaporean trainee pilot Amron Ayoub, 23, his South Korean girlfriend Miss Song Jisoo, 24, and her parents, Madam Kim Mee-Kyung , 53 and Mr Song Jungwoo, 55.
All four were standing behind a car that Mr Amron had been driving. The car had broken down on the chevron marking before the exit to Yio Chu Kang Road.
The three South Koreans died on the spot and Mr Amron died later at Khoo Teck Puat Hospital.
In his sentencing submissions, Deputy Public Prosecutor Winston Man said Toh's driving conduct should have "no place on the roads in Singapore".
He also pointed out that the amount of nitrazepam, a prescription-only tranquiliser, found in Toh's blood was twice the level at which it would have produced toxic effects like drowsiness.
That is an "egregious factor" in light of Toh's previous drug offences.
In mitigation, Toh's lawyer Mr Abdul Hamid Sultan said Toh has a family history of mental illness, and that he gets anxious and stressed easily.
District Judge Low Wee Ping said he was "too shaken to make a decision today". The hearing is adjourned to May 29.
