The 34-year-old man who allegedly killed a trainee pilot, his Korean girlfriend and her parents in a CTE crash last August is due to appear in court on Friday.
He could face charges of causing death by dangerous driving and driving under the influence of drugs.
Police said in a media statement on Thursday that the unnamed driver's licence had been suspended since Aug 9, the day of the accident, and that the suspension will remain in force until the outcome of his case in court.
Mr Amron Ayoub, 23, was driving his girlfriend Jamie Song Jisoo, 24, her brother and her parents to the airport before 4am last National Day when they had a flat tyre along the Central Expressway. They had pulled up at a chevron area near the Yio Chu Kang exit and all of them got out, when an MPV hit them from behind, killing Ms Song and her parents instantly. Her brother was unhurt as he was standing by the side of the road.
Mr Amron, who suffered multiple injuries, died in Khoo Teck Puat hospital the following day.
If found guilty of dangerous driving causing death, the driver can be jailed for up to five years. For driving under the influence of drugs, he may be jailed for up to six months or fined up to $5,000.