Rishi Pal (59), currently posted with PCR Command at the police headquarters, was arrested and suspended from service and a case under 304 (A) of IPC (culpable homicide not amounting to murder) was slapped on him, a senior police official said.
The deceased, all of whom were sanitation workers, have been identified as Shakuntala (55), Meera (50) and Maya (28).
Pal, who is due to retire from service in January next year, had night duty at Police Headquarters and was returning to his home in Faridabad driving his Santro car, they said, adding he apparently dozed off and lost control of the car.
Eyewitnesses said that all three died on the spot.
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"A Santro car came down from Badarpur side and mowed down my mother and two others. All of them died. The driver was later caught," said son of one of the women killed in the incident.
An FIR against the sub-inspector has been registered at Badarpur Police Station.
While police claimed that the sub inspector stopped on the spot and made a PCR call, eyewitnesses said he was caught by toll plaza guards.
"We have been hired by toll authorities for cleaning the stretch. Our shift starts at 7:30 AM, the incident took place around 9:30 AM. The driver who was later identified as a policeman was caught by the guards," said one of the woman who escaped unhurt.