A judge branded him "the ultimate road terror".
Tan Yang Chin was already serving a one-year road ban for drink-driving when he nodded off at the wheel, then woke up and veered into a taxi - injuring its driver and his two passengers before speeding off.
On Wednesday the 34-year-old banquet operations manager was jailed for 13 months and banned from driving for eight years on three charges.
Deputy Public Prosecutor Michelle Lu said he was driving at a "very high speed" along East Coast Parkway when he fell asleep and hit the centre divider.
He woke up and veered towards the extreme left lane and hit the back of Mr Goh Chee Kwang's taxi.
Mr Goh, 51, who was taking two passengers to the airport, lost control and his cab hit the road barrier and overturned.
One of the passengers, Ms Wang Jing, 28, from China, broke her pelvis. The cabby and the other Chinese passenger, Ms Peng Xinxiu, 37, were also hurt and suffered "bodily injuries".
Tan sped off and left his car unattended about 1km away on the highway.
Investigations showed that Tan had driven his car about three times for work purposes on Feb 6 this year before causing the accident at 1.14am the next day.
In passing sentence, District Judge Low Wee Ping told him: "You are the ultimate road terror."
Tan, he said, defied the driving ban imposed by the court in April last year and drove at least four times in the two months before his disqualification ended.
The judge also said Tan was a bad role model for his 10-year-old son despite him claiming he did not want to project a bad image.
Pleading for leniency, Tan said his mother has a heart problem and is undergoing dialysis.
"I have a 10-year-old son, who is schooling," he said. "I don't want to project a bad image to him if I am to get a harsher punishment."
The three sentences for causing grievous hurt, driving while under disqualification and failing to render assistance are to run consecutively.
Two charges of causing hurt to the cabby and Ms Peng, and failing to stop were considered during his sentencing.
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